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**Apache Airflow version**: 2.1.1


**Kubernetes version (if you are using kubernetes)** (use `kubectl version`):
```
Client Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.1", GitCommit:"5e58841cce77d4bc13713ad2b91fa0d961e69192", GitTreeState:"clean", BuildDate:"2021-05-12T14:11:29Z", GoVersion:"go1.16.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.2", GitCommit:"52c56ce7a8272c798dbc29846288d7cd9fbae032", GitTreeState:"clean", BuildDate:"2020-04-16T11:48:36Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}
WARNING: version difference between client (1.21) and server (1.18) exceeds the supported minor version skew of +/-1
```

**Environment**:

- **Cloud provider or hardware configuration**: Scalway Kubernetes Kapsule
- **OS** (e.g. from /etc/os-release): macOS
- **Kernel** (e.g. `uname -a`): Darwin Louisons-MacBook-Pro.local 20.5.0 Darwin Kernel Version 20.5.0: Sat May  8 05:10:33 PDT 2021; root:xnu-7195.121.3~9/RELEASE_X86_64 x86_64
- **Install tools**:
- **Others**:

**What happened**:

While trying to write a simple dag with KubernetesPodExecutor, I noticed that in certain cases, the pod is launched but not always. By investigating a bit more, I found that when the string `".json"` is present in parameters of the KubernetesPodOperator, it will not work.
I tried to set up a minimal example to reproduce the bug.
I manage to reproduce the bug on my kubernetes cluster and my Airflow instance (if it can help)

```python
import datetime

import airflow
from airflow.utils.dates import days_ago
from airflow.providers.cncf.kubernetes.operators.kubernetes_pod import \
    KubernetesPodOperator


DAG_NAME = "trigger_test"
default_args = {
    "owner": "Rapsodie Data",
    "depends_on_past": False,
    "wait_for_downstream": False,
    "email": [""],
    "email_on_failure": False,
    "email_on_retry": False,
    "retries": 0,
    "retry_delay": datetime.timedelta(minutes=20),
}
with airflow.DAG(
        "michel",
        catchup=False,
        default_args=default_args,
        start_date=days_ago(1),
        schedule_interval="*/10 * * * *",
) as dag:
    kubernetes_min_pod_json = KubernetesPodOperator(
        # The ID specified for the task.
        task_id='pod-ex-minimum_json',
        name='pod-ex-minimum_json',
        cmds=['echo'],
        namespace='default',
        arguments=["vivi.json"],
        image='gcr.io/gcp-runtimes/ubuntu_18_0_4'
    )
    kubernetes_min_pod_txt = KubernetesPodOperator(
        # The ID specified for the task.
        task_id='pod-ex-minimum_txt',
        name='pod-ex-minimum_txt',
        cmds=['echo'],
        namespace='default',
        arguments=["vivi.txt"],
        image='gcr.io/gcp-runtimes/ubuntu_18_0_4'
    )
    kubernetes_min_pod_json
    kubernetes_min_pod_txt

```

No error message or log to give here.
Here is the logs of the scheduler while trying to execute one run: 
```
[2021-07-10 14:30:49,356] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumtxt.36d56ddf03e544669100f7a99657db6d had an event of type MODIFIED
[2021-07-10 14:30:49,356] {kubernetes_executor.py:205} INFO - Event: michelpodexminimumtxt.36d56ddf03e544669100f7a99657db6d Succeeded
[2021-07-10 14:30:49,996] {kubernetes_executor.py:368} INFO - Attempting to finish pod; pod_id: michelpodexminimumtxt.36d56ddf03e544669100f7a99657db6d; state: None; annotations: {'dag_id': 'michel', 'task_id': 'pod-ex-minimum_txt', 'execution_date': '2021-07-10T14:20:00+00:00', 'try_number': '1'}
[2021-07-10 14:30:50,004] {kubernetes_executor.py:546} INFO - Changing state of (TaskInstanceKey(dag_id='michel', task_id='pod-ex-minimum_txt', execution_date=datetime.datetime(2021, 7, 10, 14, 20, tzinfo=tzlocal()), try_number=1), None, 'michelpodexminimumtxt.36d56ddf03e544669100f7a99657db6d', 'default', '56653001583') to None
[2021-07-10 14:30:50,006] {scheduler_job.py:1222} INFO - Executor reports execution of michel.pod-ex-minimum_txt execution_date=2021-07-10 14:20:00+00:00 exited with status None for try_number 1
[2021-07-10 14:31:00,478] {scheduler_job.py:964} INFO - 2 tasks up for execution:
	<TaskInstance: michel.pod-ex-minimum_txt 2021-07-10 14:30:59.199174+00:00 [scheduled]>
	<TaskInstance: michel.pod-ex-minimum_json 2021-07-10 14:30:59.199174+00:00 [scheduled]>
[2021-07-10 14:31:00,483] {scheduler_job.py:993} INFO - Figuring out tasks to run in Pool(name=default_pool) with 128 open slots and 2 task instances ready to be queued
[2021-07-10 14:31:00,483] {scheduler_job.py:1021} INFO - DAG michel has 0/16 running and queued tasks
[2021-07-10 14:31:00,484] {scheduler_job.py:1021} INFO - DAG michel has 1/16 running and queued tasks
[2021-07-10 14:31:00,484] {scheduler_job.py:1086} INFO - Setting the following tasks to queued state:
	<TaskInstance: michel.pod-ex-minimum_txt 2021-07-10 14:30:59.199174+00:00 [scheduled]>
	<TaskInstance: michel.pod-ex-minimum_json 2021-07-10 14:30:59.199174+00:00 [scheduled]>
[2021-07-10 14:31:00,492] {scheduler_job.py:1128} INFO - Sending TaskInstanceKey(dag_id='michel', task_id='pod-ex-minimum_txt', execution_date=datetime.datetime(2021, 7, 10, 14, 30, 59, 199174, tzinfo=Timezone('UTC')), try_number=1) to executor with priority 1 and queue default
[2021-07-10 14:31:00,492] {base_executor.py:82} INFO - Adding to queue: ['airflow', 'tasks', 'run', 'michel', 'pod-ex-minimum_txt', '2021-07-10T14:30:59.199174+00:00', '--local', '--pool', 'default_pool', '--subdir', '/opt/airflow/dags/repo/dags/k8s.py']
[2021-07-10 14:31:00,493] {scheduler_job.py:1128} INFO - Sending TaskInstanceKey(dag_id='michel', task_id='pod-ex-minimum_json', execution_date=datetime.datetime(2021, 7, 10, 14, 30, 59, 199174, tzinfo=Timezone('UTC')), try_number=1) to executor with priority 1 and queue default
[2021-07-10 14:31:00,493] {base_executor.py:82} INFO - Adding to queue: ['airflow', 'tasks', 'run', 'michel', 'pod-ex-minimum_json', '2021-07-10T14:30:59.199174+00:00', '--local', '--pool', 'default_pool', '--subdir', '/opt/airflow/dags/repo/dags/k8s.py']
[2021-07-10 14:31:00,498] {kubernetes_executor.py:504} INFO - Add task TaskInstanceKey(dag_id='michel', task_id='pod-ex-minimum_txt', execution_date=datetime.datetime(2021, 7, 10, 14, 30, 59, 199174, tzinfo=Timezone('UTC')), try_number=1) with command ['airflow', 'tasks', 'run', 'michel', 'pod-ex-minimum_txt', '2021-07-10T14:30:59.199174+00:00', '--local', '--pool', 'default_pool', '--subdir', '/opt/airflow/dags/repo/dags/k8s.py'] with executor_config {}
[2021-07-10 14:31:00,500] {kubernetes_executor.py:504} INFO - Add task TaskInstanceKey(dag_id='michel', task_id='pod-ex-minimum_json', execution_date=datetime.datetime(2021, 7, 10, 14, 30, 59, 199174, tzinfo=Timezone('UTC')), try_number=1) with command ['airflow', 'tasks', 'run', 'michel', 'pod-ex-minimum_json', '2021-07-10T14:30:59.199174+00:00', '--local', '--pool', 'default_pool', '--subdir', '/opt/airflow/dags/repo/dags/k8s.py'] with executor_config {}
[2021-07-10 14:31:00,503] {kubernetes_executor.py:292} INFO - Kubernetes job is (TaskInstanceKey(dag_id='michel', task_id='pod-ex-minimum_txt', execution_date=datetime.datetime(2021, 7, 10, 14, 30, 59, 199174, tzinfo=Timezone('UTC')), try_number=1), ['airflow', 'tasks', 'run', 'michel', 'pod-ex-minimum_txt', '2021-07-10T14:30:59.199174+00:00', '--local', '--pool', 'default_pool', '--subdir', '/opt/airflow/dags/repo/dags/k8s.py'], None, None)
[2021-07-10 14:31:00,558] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b had an event of type ADDED
[2021-07-10 14:31:00,558] {scheduler_job.py:1222} INFO - Executor reports execution of michel.pod-ex-minimum_txt execution_date=2021-07-10 14:30:59.199174+00:00 exited with status queued for try_number 1
[2021-07-10 14:31:00,559] {kubernetes_executor.py:200} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b Pending
[2021-07-10 14:31:00,559] {scheduler_job.py:1222} INFO - Executor reports execution of michel.pod-ex-minimum_json execution_date=2021-07-10 14:30:59.199174+00:00 exited with status queued for try_number 1
[2021-07-10 14:31:00,563] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b had an event of type MODIFIED
[2021-07-10 14:31:00,563] {kubernetes_executor.py:200} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b Pending
[2021-07-10 14:31:00,576] {scheduler_job.py:1249} INFO - Setting external_id for <TaskInstance: michel.pod-ex-minimum_json 2021-07-10 14:30:59.199174+00:00 [queued]> to 1
[2021-07-10 14:31:00,577] {scheduler_job.py:1249} INFO - Setting external_id for <TaskInstance: michel.pod-ex-minimum_txt 2021-07-10 14:30:59.199174+00:00 [queued]> to 1
[2021-07-10 14:31:00,621] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b had an event of type MODIFIED
[2021-07-10 14:31:00,622] {kubernetes_executor.py:200} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b Pending
[2021-07-10 14:31:00,719] {kubernetes_executor.py:292} INFO - Kubernetes job is (TaskInstanceKey(dag_id='michel', task_id='pod-ex-minimum_json', execution_date=datetime.datetime(2021, 7, 10, 14, 30, 59, 199174, tzinfo=Timezone('UTC')), try_number=1), ['airflow', 'tasks', 'run', 'michel', 'pod-ex-minimum_json', '2021-07-10T14:30:59.199174+00:00', '--local', '--pool', 'default_pool', '--subdir', '/opt/airflow/dags/repo/dags/k8s.py'], None, None)
[2021-07-10 14:31:00,752] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 had an event of type ADDED
[2021-07-10 14:31:00,752] {kubernetes_executor.py:200} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 Pending
[2021-07-10 14:31:00,769] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 had an event of type MODIFIED
[2021-07-10 14:31:00,770] {kubernetes_executor.py:200} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 Pending
[2021-07-10 14:31:00,870] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 had an event of type MODIFIED
[2021-07-10 14:31:00,871] {kubernetes_executor.py:200} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 Pending
[2021-07-10 14:31:03,961] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b had an event of type MODIFIED
[2021-07-10 14:31:03,961] {kubernetes_executor.py:200} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b Pending
[2021-07-10 14:31:05,538] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 had an event of type MODIFIED
[2021-07-10 14:31:05,542] {kubernetes_executor.py:200} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 Pending
[2021-07-10 14:31:07,092] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b had an event of type MODIFIED
[2021-07-10 14:31:07,092] {kubernetes_executor.py:200} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b Pending
[2021-07-10 14:31:08,163] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b had an event of type MODIFIED
[2021-07-10 14:31:08,164] {kubernetes_executor.py:208} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b is Running
[2021-07-10 14:31:08,818] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 had an event of type MODIFIED
[2021-07-10 14:31:08,820] {kubernetes_executor.py:200} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 Pending
[2021-07-10 14:31:09,924] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 had an event of type MODIFIED
[2021-07-10 14:31:09,925] {kubernetes_executor.py:208} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 is Running
[2021-07-10 14:31:28,861] {dagrun.py:429} ERROR - Marking run <DagRun michel @ 2021-07-10 14:30:59.199174+00:00: manual__2021-07-10T14:30:59.199174+00:00, externally triggered: True> failed
[2021-07-10 14:31:45,227] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 had an event of type MODIFIED
[2021-07-10 14:31:45,227] {kubernetes_executor.py:205} INFO - Event: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1 Succeeded
[2021-07-10 14:31:45,454] {kubernetes_executor.py:368} INFO - Attempting to finish pod; pod_id: michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1; state: None; annotations: {'dag_id': 'michel', 'task_id': 'pod-ex-minimum_json', 'execution_date': '2021-07-10T14:30:59.199174+00:00', 'try_number': '1'}
[2021-07-10 14:31:45,459] {kubernetes_executor.py:546} INFO - Changing state of (TaskInstanceKey(dag_id='michel', task_id='pod-ex-minimum_json', execution_date=datetime.datetime(2021, 7, 10, 14, 30, 59, 199174, tzinfo=tzlocal()), try_number=1), None, 'michelpodexminimumjson.db72c28bed7e4d0cad6cf8594bcbd4f1', 'default', '56653030468') to None
[2021-07-10 14:31:45,463] {scheduler_job.py:1222} INFO - Executor reports execution of michel.pod-ex-minimum_json execution_date=2021-07-10 14:30:59.199174+00:00 exited with status None for try_number 1
[2021-07-10 14:31:47,817] {kubernetes_executor.py:147} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b had an event of type MODIFIED
[2021-07-10 14:31:47,818] {kubernetes_executor.py:205} INFO - Event: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b Succeeded
[2021-07-10 14:31:48,373] {kubernetes_executor.py:368} INFO - Attempting to finish pod; pod_id: michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b; state: None; annotations: {'dag_id': 'michel', 'task_id': 'pod-ex-minimum_txt', 'execution_date': '2021-07-10T14:30:59.199174+00:00', 'try_number': '1'}
[2021-07-10 14:31:48,376] {kubernetes_executor.py:546} INFO - Changing state of (TaskInstanceKey(dag_id='michel', task_id='pod-ex-minimum_txt', execution_date=datetime.datetime(2021, 7, 10, 14, 30, 59, 199174, tzinfo=tzlocal()), try_number=1), None, 'michelpodexminimumtxt.a291f1d7ffeb45abb86c51c9b7b5a95b', 'default', '56653031774') to None
[2021-07-10 14:31:48,378] {scheduler_job.py:1222} INFO - Executor reports execution of michel.pod-ex-minimum_txt execution_date=2021-07-10 14:30:59.199174+00:00 exited with status None for try_number 1
```

Don't hesitate to ask me if you need more info

airflow/providers/cncf/kubernetes/operators/kubernetes_pod.py
in_cluster: Optional[bool] = None,
        cluster_context: Optional[str] = None,
        labels: Optional[Dict] = None,
        reattach_on_restart: bool = True,
        startup_timeout_seconds: int = 120,
        get_logs: bool = True,
        image_pull_policy: Optional[str] = None,
        annotations: Optional[Dict] = None,
        resources: Optional[k8s.V1ResourceRequirements] = None,
        affinity: Optional[k8s.V1Affinity] = None,
        config_file: Optional[str] = None,
        node_selectors: Optional[dict] = None,
        node_selector: Optional[dict] = None,
        image_pull_secrets: Optional[List[k8s.V1LocalObjectReference]] = None,
        service_account_name: Optional[str] = None,
        is_delete_operator_pod: bool = False,
        hostnetwork: bool = False,
        tolerations: Optional[List[k8s.V1Toleration]] = None,
        security_context: Optional[Dict] = None,
        dnspolicy: Optional[str] = None,
        schedulername: Optional[str] = None,
        full_pod_spec: Optional[k8s.V1Pod] = None,
        init_containers: Optional[List[k8s.V1Container]] = None,
        log_events_on_failure: bool = False,
        do_xcom_push: bool = False,
        pod_template_file: Optional[str] = None,
        priority_class_name: Optional[str] = None,
        pod_runtime_info_envs: List[PodRuntimeInfoEnv] = None,
        termination_grace_period: Optional[int] = None,
        configmaps: Optional[str] = None,