With the upgrade to 1.23wmf15 in the past 24 hours, meta's [[m:Special/Block]] reasons in the available drop down have returned to the default. This is despite the file MediaWiki:Ipbreason-dropdown being updated, present and unchanged [https://meta.wikimedia.org/w/index.php?title=MediaWiki:Ipbreason-dropdown&action=history]. Editing the file did not make any difference, nor deleting and undeleting the file.
I have checked enWS (same update schedule, and there is no issue with it picking up the reason's file). My check of the updates for the version only sees mention of an update of the 'docblock'