1. On betalabs select one of the filters from Watchlisted pages group. Add any filter from any group or use several Watchlisted filters.
2. Copy the url and paste it - "Fatal exception of type "Wikimedia\Rdbms\DBQueryError" is displayed (nothing in the Console).
{F7881913}
No other combination of filters (as far as I could) see produces the error.
url samples that produce errors (highlighting is not important):
https://en.wikipedia.beta.wmflabs.org/wiki/Special:RecentChanges?damaging=likelygood&goodfaith=&hideliu=0&hideanons=0&userExpLevel=&hidemyself=0&hidebyothers=0&hidebots=0&hidehumans=0&hideminor=0&hidemajor=0&hidelastrevision=0&hidepreviousrevisions=0&hidepageedits=0&hidenewpages=0&hidecategorization=0&hideWikibase=0&hidelog=0&watchlist=watchednew&highlight=1&limit=50
https://en.wikipedia.beta.wmflabs.org/w/index.php?title=Special:RecentChanges&damaging=&goodfaith=&hideliu=0&hideanons=0&userExpLevel=&hidemyself=0&hidebyothers=0&hidebots=0&hidehumans=0&hideminor=0&hidemajor=0&hidelastrevision=0&hidepreviousrevisions=0&hidepageedits=1&hidenewpages=1&hidecategorization=1&hideWikibase=1&hidelog=0&watchlist=watched&highlight=1&limit=50&watchlist__watched_color=c5&changeType__hidelog_color=c3