makes me point to a similar concern for probably the same problem
See After update to latest beta, backups broken for my reply which is basically that canary varies, but you can keep an eye on them. Sometimes they’re on the verge of Beta, like now, sometimes far away. You can also test a canary in better or worse ways, and you can revert back to Beta channel and wait. Eventually a genuine fixed Beta should emerge (I sincerely hope – not seeing much progress though).
Beta for me was extremely unreliable due to “Unexpected difference in fileset” up until the 2.0.4.22 fix whose description points to a workaround if other old beta bugs don’t bother you and you have space:
–no-auto-compact added in Options → Advanced options then checkmarked will avoid compact bugs.