False negative when using a TypeVar bound to a TypedDict

The following code should produce a type error.

```python
from typing import Generic, TypeVar, TypedDict

class TD1(TypedDict):
    a: str

T = TypeVar("T", bound=TD1)

class G(Generic[T]):
    def method1(self) -> T:
        return {"a": ""} # No error!
```

This is related to mypy issue https://github.com/python/mypy/issues/11812.