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It's happened again.
I implemented a graph to track thanks (story https://wikimedia.mingle.thoughtworks.com/projects/mobile/cards/1630)
and there seems to be an exception thrown when you visit a diff page.

https://en.m.wikipedia.org/wiki/Special:MobileDiff/592882455...592882560
Error: Module not found: notifications Error {} 

On
https://m.mediawiki.org/wiki/Special:MobileDiff/889425?mobileaction=stable
Everything seems fine.

Also see related bug 60550

Prioritization and scheduling of this bug is tracked on Mingle card https://wikimedia.mingle.thoughtworks.com/projects/mobile/cards/1656

Seems to be fixed now.

Out of curiosity, how was it fixed?

I suspect I85d878d6b9452cbc3f21851f9bd63a4a1408cca1