### 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`
ddbstreams = aws_stack.create_external_boto_client("dynamodbstreams")
        kinesis = aws_stack.create_external_boto_client("kinesis")
        table_name = f"ddb-{short_uid()}"
        aws_stack.create_dynamodb_table(
            table_name,
            partition_key=PARTITION_KEY,
            stream_view_type="NEW_AND_OLD_IMAGES",
        )
        table = dynamodb.Table(table_name)
        # as
        expected_arn_prefix = "arn:aws:dynamodb:" + aws_stack.get_local_region()
        assert table.table_arn.startswith(expected_arn_prefix)
        assert table.latest_stream_arn.startswith(expected_arn_prefix)
        # as
        stream_tables = [s["TableName"] for s in ddbstreams.list_streams()["Streams"]]
        assert table_name in stream_tables
        stream_name = get_kinesis_stream_name(table_name)
        assert stream_name in kinesis.list_streams()["StreamNames"]
        # as
        result = ddbstreams.describe_stream(StreamArn=table.latest_stream_arn)["StreamDescription"]
        assert "Shards" in result
        for shard in result["Shards"]:
            assert re.match(r"^shardId-[0-9]{20}-[a-zA-Z0-9]{1,36}$", shard["ShardId"])
        # cl
        delete_table(table_name)
        # as
        stream_tables = [s["TableName"] for s in ddbstreams.list_streams()["Streams"]]
        assert table_name not in stream_tables
        assert stream_name not in kinesis.list_streams()["StreamNames"]
    def test_multiple_update_expressions(self, dynamodb):