|Resolved||zeljkofilipin||T206662 1.33.0-wmf.8 deployment blockers|
|Resolved||Pchelolo||T211805 Call to a member function format() on a non-object (boolean)|
Looks like the only thing that changed in EventBus from wmf.6 to wmf.8 is this, and it does not look related. 😐
I think this is the reason and in particular @mobrovac last comment that for some reason went unnoticed.
https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/EventBus/+/476314/ was only SWATed into wmf.6 and it was not merged into master.