It's annoying to get thrown out of Approval in several cases; but some cases are valid. Either way, what can be further annoying is not having Code Collaborator indicate any information in the code r...
Regarding this, it might actually be better if when a Reviewer clicks the overall Approve button, that it logs in the Chat box about just that (who approved with optional date-time stamp). Then overall approval status can be seen within context of the file activity logs that are auto-generated there in the Chat box; in turn that provide great context as to exactly what files changed after a particular reviewer had Approved the review!
Granted that could get a bit noisy, taking up vertical lines in the Chat box; so consider simplifying it down to a single line which can list out multiple reviewers/observers who have Approved the review up to that point in the Chat log.