I have insteadOf aliases in my git configuration, like this:

$ git config --list | grep me:
url.ssh://git@github.com/larsks/.insteadof=me:

If I configure a repository with a remote using that alias, as in:

git remote set-url origin me:git-bug-example

Then when I attempt to git bug push with this configuration, it fails with an error:

$ git bug push
Error: repository not found

It looks like git bug is performing git operations with something that doesn't parse git configuration files. Aliases like this can be expanded using the git remote get-url command:

$ git remote get-url origin
ssh://git@github.com/larsks/git-bug-example