Error details on Meta-wiki (watchlist contains 14k pages):
Request from 126.96.36.199 via cp3052.esams.wmnet, ATS/8.0.5
Error: 504, Connection Timed Out at 2020-02-07 13:29:50 GMT
Error details on Commons (watchlist contains 12k pages):
[Xj1qkgpAAD8AABAp32MAAABA] 2020-02-07 13:49:02: Fatal exception of type "WMFTimeoutException"
Special:EditWatchlist/raw is working. Editing of smaller watchlists (3k pages on ukwiki, 400 on wmuawiki, etc.) is working.
Did I hit a ceiling of max pages in a watchlist or is there any other issue?