Merged commits from a tag into a branch is rejected by the trusted commit authors hook

To reproduce:

• Enable the trusted commit authors hook with "can only push own commits mode" selected
• Login as another BBS user and create a branch from master
• Commit to master as this user (change git config)
• Create a tag from this branch
• Delete this branch both locally and remotely
• Login as another user
• Note that this commit is not our own and that this commit only exists on that tag (check using git tag --contains <commit-hash> and git branch --contains <commit-hash>) (tag should be the only one that returns anything)
• Merge the tag into master and push changes
• Hook rejects push as the merged commit is from another user

Simplest solution is to exclude these tags like we do with branches (this is to handle merges and rebases) as the commit already made it through the hook by the original committer.