Unexpected `invalid-return-type` when using narrowed dict as argument to dataclass

### Summary

I expect the return value to be properly typed with no errors, because following the `if` condition, `res` should be known to be a `dict`

https://play.ty.dev/caceacc9-cb4a-4193-b021-d2f9a8723ee3


### Version

playground 8770b9550