While working at a patch for Special:AbuseLog I noticed a tiny bug with the Title field: if you focus it and then click away, a red border appears and the aria-invalid attribute is added. This doesn't prevent form submission, is just an annoying visual bug. Maybe related to T194425 and the patch which caused it? Adding @matmarex just in case.
Customize query in gerrit
|mediawiki/core||master||+9 -3||mw.widgets.TitleWidget: Don't mark optional fields as invalid when empty|