https://groups.google.com/g/linux.debian.bugs.dist/c/7hZiQYDXaiI
Seems to be related to the current version of kmod:
It seems to
be triggered when upgrading kmod (which provides depmod) to
30+20220630-1.And downgrading to kmod 29-1+b1 makes this warning disappear.
There is a patch proposed.