### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

* Create any table with any records
* Do a TransactGetItems on the table
* Localstack returns 
```
ResourceNotFoundException: Cannot do operations on a non-existent table
```

### Expected Behavior

TransactGetItems should succeed.

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

```
docker-compose up
```

`docker-compose.yml`
```
version: '3'

services:
  localstack:
    image: localstack/localstack
    environment:
      - DEFAULT_REGION=eu-west-2
      - SERVICES=dynamodb
      - DOCKER_HOST=unix:///var/run/docker.sock
    ports:
      - 4566:4566
```

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

```
#! /bin/bash
aws --endpoint-url=http://localhost:4566 dynamodb create-table --attribute-definitions AttributeName=forumId,AttributeType=S --table-name forum --key-schema AttributeName=forumId,KeyType=HASH --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5 > /dev/null
aws --endpoint-url=http://localhost:4566 dynamodb put-item --table-name forum --item '{"forumId": {"S": "forum001"}, "data": {"S": "helloworld"}}' > /dev/null
aws --endpoint-url=http://localhost:4566 dynamodb get-item --table-name forum --key '{"forumId": {"S": "forum001"}}' > /dev/null
# This one fails
aws --endpoint-url=http://localhost:4566 dynamodb transact-get-items --transact-items '[{"Get": {"Key":{"forumId": {"S": "forum001"}}, "TableName": "forum"}}]' > /dev/null
```


### Environment

```markdown
- OS: MacOS 10.15.7
- LocalStack: latest, digest 843db39ff1df83fd537e15b30e39d6fb8c3590efd6bf3f6f96b1734418fbd19f
```


### Anything else?

This works in `localstack/localstack:0.14.1`
headers = {"Refresh": f"0; url={config.service_url('dynamodb')}/shell/index.html"}
        return Response("", headers=headers)
    def handle_shell_ui_request(self, request: werkzeug.Request, req_path: str) -> Response:
        
        
        
        
        req_path = f"/{req_path}" if not req_path.startswith("/") else req_path
        url = f"{self.get_forward_url()}/shell{req_path}"
        result = requests.request(
            method=request.method, url=url, headers=request.headers, data=request.data
        )
        return Response(result.content, headers=dict(result.headers), status=result.status_code)
    @handler("CreateTable", expand=False)
    def create_table(
        self,
        context: RequestContext,
        create_table_input: CreateTableInput,
    ) -> CreateTableOutput:
        
        table_name = create_table_input["TableName"]
        if self.table_exists(table_name):
            raise ResourceInUseException("Cannot create preexisting table")
        billing_mode = create_table_input.get("BillingMode")
        provisioned_throughput = create_table_input.get("ProvisionedThroughput")
        if billing_mode == BillingMode.PAY_PER_REQUEST and provisioned_throughput is not None:
            raise ValidationException(
                "One or more parameter values were invalid: Neither ReadCapacityUnits nor WriteCapacityUnits can be "
                "specified when BillingMode is PAY_PER_REQUEST"
            )