(🐞) Crash with TypedDict defined in method (cache moment)

[KotlinIsland]

from typing import TypedDict

class C:
    def f(self) -> None:
        class D(TypedDict): ...
        self.d: D

> rm -rf .mypy_cache; mypy test.py; mypy -c "import test"
Traceback (most recent call last):
  File "/home/user/projects/test-python/.venv/bin/mypy", line 8, in <module>
    sys.exit(console_entry())
  File "/home/user/projects/test-python/.venv/lib/python3.8/site-packages/mypy/__main__.py", line 15, in console_entry
    main()
  File "mypy/main.py", line 99, in main
  File "mypy/main.py", line 178, in run_build
  File "mypy/build.py", line 189, in build
  File "mypy/build.py", line 262, in _build
  File "mypy/build.py", line 2938, in dispatch
  File "mypy/build.py", line 3329, in process_graph
  File "mypy/build.py", line 3410, in process_fresh_modules
  File "mypy/build.py", line 2108, in fix_cross_refs
  File "mypy/fixup.py", line 52, in fixup_module
  File "mypy/fixup.py", line 135, in visit_symbol_table
  File "mypy/fixup.py", line 72, in visit_type_info
  File "mypy/fixup.py", line 137, in visit_symbol_table
  File "mypy/nodes.py", line 1040, in accept
  File "mypy/fixup.py", line 193, in visit_var
  File "mypy/types.py", line 398, in accept
  File "mypy/fixup.py", line 230, in visit_type_alias_type
  File "mypy/fixup.py", line 366, in lookup_fully_qualified_alias
  File "mypy/lookup.py", line 49, in lookup_fully_qualified
AssertionError: Cannot find component 'D' for 'test.C.D'

mypy 1.6.1