Specifically, the message abusefilter-log-detailedentry-meta is missing if the revision is revision deleted, but the viewer is an admin
Looking at the dom shows that there is an empty <p> element where the info should be, and the only reason I could find for that to be the case would be https://gerrit.wikimedia.org/g/mediawiki/extensions/AbuseFilter/+/d7a1d9ac4c220515aa3bd7b554bd73e4dc11d959/includes/special/SpecialAbuseLog.php#1091
- revision is rev-deled, so SpecialAbuseLog::isHidden returns 'implicit'
- early return without the overall hit summary because 'implicit' is truthy
- rest of the form is still shown because as a sysop I can see the underlying revision
- fix is probably allowing $hidden to be 'implicit' if $isListItem is false