The mobile version of the Special:Watchlist (which hopefully we can one day remove) is making use of the SpecialWatchlistQuery hook (deprecated in deprecated in version 1.24.) As its removal becomes pending we need to remove this code ASAP.
It appears ChangesListSpecialPageQuery can be used in its place.
Test this one on the beta cluster. Exploratory testing is needed.
Try all the different tabs.
They should be consistent with the titles shown on desktop (https://en.wikipedia.beta.wmflabs.org/wiki/Special:Watchlist?hidepreviousrevisions=1&hidecategorization=1&hideWikibase=1&limit=500&days=90&urlversion=2)