The merge won't bring more changes than if the PR was squashed in a single commit though. Hopefully if you have a test broken and the PR merged two commits: one

The merge won't bring more changes than if the PR was squashed in a single commit though. Hopefully if you have a test broken and the PR merged two commits: one that refactored the code and the second one that leveraged the refector to change the behavior, you can easily try to revert the latter to check if it fixes the problem. The commit is smaller, easier to re-review, and the bug likely easier to spot.