Hi @Tlaloc
good to read this. I am currently cleaning up my Application for the release and put a lot of effort in the Help Book. Yesterday I updated to macOS 12.0.1 and my application isn't able to get the Help Book any longer.
Even the Finder doesn't show the bundle anymore. It is now a normal folder.
I spend hours try to fix my bug, and somehow it feels a bit better not to be alone.
Please keep me in touch if you find any solution. I'll do the same.