This upgrade is broken on raspberry-pi. Cause: libgcc rename. The raspberry pi version of debian (raspbian) did not delete/remove gcc-8 so the bug remains there (it's not fixed, but no longer happens to occur, for the normal debian).

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=972820

https://salsa.debian.org/rpavlik/gcc-10-compat

https://packages.debian.org/bullseye/libgcc-s1

https://forums.debian.net/viewtopic.php?t=152931

Provide guidance as to how to update raspberry debian without destroying your system.