$title->getSubpageText() on line 30 now returns a empty string instead of the Pagename. That's possibly what is causing the failures.
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Okay... {{SUBPAGENAME}} also uses the same method and also returns an empty string instead of the Pagename now. The documentation says it should return the Pagename though. Looks like the problem was caused by the patch 03397e46c5c8c3dd971c10d42636fc58145d7c1d (for T229443).