When I click reply on a thread, on error console I see:
Uncaught Error: Widget not found
at Object.OO.ui.Element.static.unsafeInfuse (Element.js:144) at Object.OO.ui.Element.static.infuse (Element.js:104) at Object.OO.ui.infuse (core.js:326) at HTMLDocument.<anonymous> (mediawiki.action.edit.js?29a7f:23) at mightThrow (load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1uclx17:3583) at process (load.php?debug=true&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1uclx17:3651)