pandas-stubs: Mypy complains about inconsistent MRO when using `isinstance()` on a generic `Series` object

To Reproduce

import pandas as pd

x: pd.Series[int] = pd.Series([1, 3, 4], name="my series")
assert isinstance(x, pd.Series)  # this line produces the error below

mypy gives the following error:

repro.py:4: error: Subclass of "Series[int]" and "TimestampSeries" cannot exist: would have inconsistent method resolution order  [unreachable]

pyright does not complain. Nor does mypy complain if I drop the [int] for pd.Series.

Please complete the following information:

• OS: Linux
• OS Version: Ubuntu 22.04
• python version: 3.10.4
• version of type checker: mypy 0.971
• version of installed pandas-stubs: 1.4.3.220829