Since the Math extension was added to Wikibase CI builds (T201496), both test and gate-and-submit builds for Wikibase have started occasionally failing with some tests in the Math extension (T248459). This happens often enough that it’s impeding our work (some changes have needed three gate-and-submit builds to be merged), so for the time being, we would like to remove Math from Wikibase CI again. (“We” being me, plus a few other colleagues on the Wikidata team who’ve voiced support for this, without any opposition so far. If anyone disagrees with this, comment here.)