Pick an article, add it to your watchlist, now edit it, try to save:
notice the Watch this page box is unchecked, and as a matter of fact the star isn't blue anymore.
Can't reproduce at en.wp.
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Actually, adding @ori. Maybe this has to do with JavaScript "experiments" at it.wiki?
I could reproduce it on frwp and on https://en.wikipedia.org/wiki/Martyn_Thomas_(rugby_player) with ?setlang=fr
and I could reproduce it on https://en.wikipedia.org/wiki/Harry_G._Shaffer after turning back, so that didn't seem to be the issue.
So I can confirm on enwp and frwp in Chrome.
Change 209504 had a related patch set uploaded (by Jforrester):
mw.Target: Fix API breakage of watchlist preference check
https://gerrit.wikimedia.org/r/209504
Change 209657 had a related patch set uploaded (by Jforrester):
mw.Target: Fix API breakage of watchlist preference check
https://gerrit.wikimedia.org/r/209657
Change 209658 had a related patch set uploaded (by Jforrester):
mw.Target: Fix API breakage of watchlist preference check
https://gerrit.wikimedia.org/r/209658
Change 209504 merged by jenkins-bot:
mw.Target: Fix API breakage of watchlist preference check
https://gerrit.wikimedia.org/r/209504
Change 209658 merged by jenkins-bot:
mw.Target: Fix API breakage of watchlist preference check
https://gerrit.wikimedia.org/r/209658
Change 209657 merged by jenkins-bot:
mw.Target: Fix API breakage of watchlist preference check
https://gerrit.wikimedia.org/r/209657