**Bug report**/**Configuration Issue**: In the course of undertaking regular monthly duties in my local capacity as a TestWiki Consul (namely, the notification and removal of inactive administrators on TestWiki), I [[ https://publictestwiki.com/w/index.php?title=Special:Log&logid=15879 | delivered ]] a mass message to five (5) users via their local user talk pages ([[ https://publictestwiki.com/wiki/Special:PermanentLink/35691 | link to list of mass message recipients ]]). **Note that there were five (5) users included in the list.** Now here is where get things interesting...note [[ https://publictestwiki.com/wiki/Special:Contributions/MediaWiki_message_delivery | the Special:Contributions/MediaWiki message delivery ]]), there are only four (4) messages delivered today despite the MediaWiki message delivery system user delivering fully five (5) messages, including [[ https://publictestwiki.com/w/index.php?title=User_talk:SHEIKH&diff=35695&oldid=34691 | this one ]] to SHEIKH yet that message is //not// included within the Special:Contributions page.
Not sure if this is either a #configuration issue or a #production_error, so added both, as I did assume that this is likely a MediaWiki core issue. If it's a deployed extension bug, that can be adjusted as well.
Anyway, I'd appreciate a thorough investigation into this bug and perhaps there's a maintenance script of some sort that can fix this?