dmyy crashes when switching to git branches which removes subdirectory

Crash Report

I am using dmypy to check code in a pre-commit hook. When switching branches, obviously a lot of files/packages come and go. It seems as if dmypy has problems with the internal cache when a formerly checked file/package is not available anymore.
I have encountered two different backtraces.

Traceback

Daemon crashed!
Traceback (most recent call last):
  File "mypy/dmypy_server.py", line 221, in serve
  File "mypy/dmypy_server.py", line 264, in run_command
  File "mypy/dmypy_server.py", line 323, in cmd_run
  File "mypy/dmypy_server.py", line 385, in check
  File "mypy/dmypy_server.py", line 559, in fine_grained_increment_follow_imports
  File "mypy/dmypy_server.py", line 688, in direct_imports
KeyError: 'removed.package'

Daemon crashed!
Traceback (most recent call last):
  File "mypy/dmypy_server.py", line 221, in serve
  File "mypy/dmypy_server.py", line 264, in run_command
  File "mypy/dmypy_server.py", line 323, in cmd_run
  File "mypy/dmypy_server.py", line 385, in check
  File "mypy/dmypy_server.py", line 577, in fine_grained_increment_follow_imports
  File "mypy/server/update.py", line 1164, in refresh_suppressed_submodules
  File "mypy/fscache.py", line 172, in listdir
  File "mypy/fscache.py", line 168, in listdir
FileNotFoundError: [Errno 2] No such file or directory: '..../deleted/directory'

To Reproduce

Switch between git branches which add/remove a complete subdirectory.

Your Environment

• Mypy version used: 0.812
• dmypy command-line: dmypy run -- --config-file mypy.ini -p package1 -p package2 -p package3
• Python version used: 3.9
• Operating system and version: MacOS

報告された dmypy コマンドを実行し、完全なサブディレクトリを追加または削除するブランチ間を切り替え、デーモンのトレースバックを確認して、失敗を再現します。mypy/dmypy_server.py の fine_grained_increment_follow_imports、direct_imports、および mypy/server/update.py と mypy/fscache.py への呼び出しから調査を始めます。ブランチの変更によって dmypy がクラッシュしなくなり、関連するリグレッションの動作がカバーされれば完了です。