User blog comment:Rappy 4187/Technical Update: March 10, 2015/@comment-452-20150310210348


 * We've been working on some tweaks to the Chat feature to improve stability and prevent situations where users could end up appearing as another user - this work is ongoing, but please do send us bug reports if you run into trouble on Chat, as this will help us gauge the success of the work.

Ah, that explains why the accepted format of models.ChatEntry became more strict.