The Debian 11 32-bit build from the latest GIT checkout just finished here and there were no errors in the build and the small test video with audio worked just fine. I am at 5.10.46-4 and have yet to do an update of the latest fixes. Could that be the issue? If you think so, I can install the updates and build again.
There really should not be a build issue because the last few checkins of the CinGG source code are very benign. I reviewed them again and the only one I can come up with as being unusual is the removal of libavdevice from ffmpeg and I tested with that mod in quite a lot.