That wasn't introduced by Catalina though, it has been there since forever.
For what I understood it happens when the macbook is forced to go to sleep/loses connectivity while in the middle of a backup. It doesn't cleanly unmount the remote file system and it causes data corruption.
There are some ways of "restoring" the remote FS but they may or may not work, are very slow, opaque (what actually was fixed?) and flaky.
I just switched to an external USB drive for Time Machine and not looking back
For what I understood it happens when the macbook is forced to go to sleep/loses connectivity while in the middle of a backup. It doesn't cleanly unmount the remote file system and it causes data corruption.
There are some ways of "restoring" the remote FS but they may or may not work, are very slow, opaque (what actually was fixed?) and flaky.
I just switched to an external USB drive for Time Machine and not looking back