Errors in repo after recreate and compact

[chiefbrain]

I have a borg archive with a size of ~3TB. The oldest backup is from 2018 and compact was never executed on it, only create, extract and prune. Executing check on it returns no error. I still have a ZFS snapshot of that archives state.
Current borg version is 1.2.8 and has always been installed and updated from the ubuntu repos.

I discovered, that there is some data in the backups that shouldnt be there, so I ran recreate on it with some path exclusions. After, I executed compact. Both executions finished without error (but took a long time (> 24h each)).

Then I executed borg check --progress --verify-data and because errors have been found, I executed borg check --repair --progress --verify-data. This is the output still visible in the screen, it executed it in:

This is a potentially dangerous function.
check --repair might lead to data loss (for kinds of corruption it is not
capable of dealing with). BE VERY CAREFUL!

Type 'YES' if you understand this and want to continue: YES
<Verifying data  21.90%                                                         108 orphaned objects found!
Archive consistency check complete, problems found.

I'm not sure what this means:

• Do I still have problems and should I run check --repair again?
• Is the only problem that compact has forgotten some objects which then were deleted by check --repair?

Furthermore, can I do something to help fix a potential problem (since I still have the ZFS snapshot of before), like

• running check after recreate and before compact to check where errors occur?
• rerun check and/or recreate on any stage with flags like verbose?

[ThomasWaldmann]

It is a bit strange that it displays 21.90% (and not 100%).

The orphaned objects are just a cosmetic issue and they should be removed now (orphaned == they are not referenced from any archive, thus they are not used and not needed).

For bug hunting, a 3TB repo and borg 1.2.8 isn't great.

If you could reproduce the issue with a small repo and a current borg version, that could be useful.