In asyncio, the Generic classes return the class itself in __class_getitem__ instead of GenericAlias, because of this they cannot be introspected as GenericAlias objects.

Running Debug|x64 interpreter...
Python 3.11.0a4+ (main, Jan 22 2022, 10:00:18) [MSC v.1930 64 bit (AMD64)] on win32
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>>> import asyncio
>>> asyncio.Future
<class '_asyncio.Future'>
>>> asyncio.Future[int] 
<class '_asyncio.Future'>
>>> list
<class 'list'>
>>> list[int]
list[int]
>>> list[int].__args__
(<class 'int'>,)
>>> asyncio.Future[int].__args__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: type object '_asyncio.Future' has no attribute '__args__'