When looking at merged https://gerrit.wikimedia.org/r/c/mediawiki/tools/codesniffer/+/603493
It has lost the last vote.
Having merged patch sets without the ✓ looks bad.
Please have a look why there are lost and may restore if possible
A list:
https://gerrit.wikimedia.org/r/q/status:merged+-label:Code-Review%252B2,50