"Unexpected error from store" after jj git fetch

[avamsi]

Just ran into this on jj 0.27.0 -- I'm pretty sure this is one of the 2 commits in my archived revset:

jj log -r archived
Error: Unexpected error from store
Caused by:
1: Object 373f0251a5ed2ca55a087ccf7ba243073850d60f of type commit not found
2: An object with id 373f0251a5ed2ca55a087ccf7ba243073850d60f could not be found

I'd prefer not nuking the repo, but I don't mind abandoning this commit (or even both the commits in the revset) -- I can't seem to be able to get jj to do that though :) (not even jj log -r archived -T change_id works).

[yuja]

Maybe you can abandon old operations that contain the missing commit object. jj debug reindex might print the first bad operation, but I don't remember. (Make sure to back up the .jj directory.)