dmypy "Daemon crashed!" with KeyError: 'sqlalchemy.orm'

Below is a repeatable dmypy invokation sequence showing a crash due to KeyError. Is there a way to get better debug output to help resolve this?

$ dmypy run -- --config-file /home/russ/pcode/edms/server/../env/mypy.ini --strict /home/russ/pcode/edms/server/deleteme.py 
Daemon started
deleteme.py:3:3: error: Unsupported operand types for + ("int" and "str")  [operator]
Found 1 error in 1 file (checked 21 source files)
$
$ dmypy run -- --config-file /home/russ/pcode/edms/server/../env/mypy.ini --strict /home/russ/pcode/edms/server/deleteme.py 
deleteme.py:3:3: error: Unsupported operand types for + ("int" and "str")  [operator]
Found 1 error in 1 file (checked 1 source file)
$
$ dmypy run -- --config-file /home/russ/pcode/edms/server/../env/mypy.ini --strict /home/russ/pcode/edms/server/deleteme.py 
deleteme.py:3:3: error: Unsupported operand types for + ("int" and "str")  [operator]
Found 1 error in 1 file (checked 1 source file)
$
$ dmypy run -- --config-file /home/russ/pcode/edms/server/../env/mypy.ini --strict /home/russ/pcode/edms/shared/deployment_check/deployment_check.py 
Success: no issues found in 1 source file
$
$ dmypy run -- --config-file /home/russ/pcode/edms/server/../env/mypy.ini --strict /home/russ/pcode/edms/server/server/EventLogger.py 
Daemon crashed!
Traceback (most recent call last):
  File "mypy/dmypy_server.py", line 223, in serve
  File "mypy/dmypy_server.py", line 266, in run_command
  File "mypy/dmypy_server.py", line 325, in cmd_run
  File "mypy/dmypy_server.py", line 387, in check
  File "mypy/dmypy_server.py", line 561, in fine_grained_increment_follow_imports
  File "mypy/dmypy_server.py", line 686, in direct_imports
KeyError: 'sqlalchemy.orm'

Beginne damit, die Befehlssequenz aus dem Issue mit dmypy sowie der gezeigten Konfiguration und den angegebenen Quellpfaden zu reproduzieren. Untersuche mypy/dmypy_server.py im Umfeld von fine_grained_increment_follow_imports und direct_imports sowie des gemeldeten KeyError für sqlalchemy.orm. Als erledigt gilt die Aufgabe, wenn der Daemon nicht mehr abstürzt und für diesen Fall nützliche Diagnoseausgaben liefert.