It seems that module c4d.bitmaps is missing from the auto completion package initialization:
/Applications/Maxon Cinema 4D R25/resource/modules/python/libs/python39/c4d/_ _ init _ _.py :
...
from c4d import documents
from c4d import gui
from c4d import modules
from c4d import plugins
from c4d import storage
from c4d import threading
from c4d import utils
All the other classes/modules are imported, except bitmaps. Is this intentional or a bug?