I know that similar questions were asked before, but I think my is a little bit different, so please don't point me to existing threads.

I'm migrating our old svn repo to git.

I did git svn clone path --authors-file abc.txt and everything seemend legit to me. Then I did git remote add origin xyz and git push --all origin and it also worked.

I created this repo as test one, with only me having access to both local repo and origin. No changes were made in project held on this repo, nothing to commit, no pushing and so on. There is also only one branch, because someone initialized svn years ago without creating proper folder structure (branches, trunk, tags). Meanwhile someone pushed their work to svn, so I tried to git svn fetch (which worked), and git svn rebase which didn't, giving me error:

Unable to determine upstream SVN information from working tree history

Is there any reason why git svn decided to stop working?