when loading https://www.wikidata.org/wiki/Q50667990?debug=true I get
16:08:37.795 load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3860 jQuery.Deferred exception: async.parallel is not a function TypeError: async.parallel is not a function at init (https://www.wikidata.org/w/load.php?debug=true&lang=en&modules=ext.gadget.PrimarySources&only=scripts&skin=vector&version=05jh4p0:646:11) at HTMLDocument.<anonymous> (https://www.wikidata.org/w/load.php?debug=true&lang=en&modules=ext.gadget.PrimarySources&only=scripts&skin=vector&version=05jh4p0:666:5) at mightThrow (https://www.wikidata.org/w/load.php?debug=true&lang=en&modules=jquery%2Cmediawiki%7Cmediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3583:29) at process (https://www.wikidata.org/w/load.php?debug=true&lang=en&modules=jquery%2Cmediawiki%7Cmediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3651:12) undefined jQuery.Deferred.exceptionHook @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3860 process @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3655 setTimeout (async) (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3689 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3317 add @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3376 (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3709 jQuery.Deferred @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:10866 then @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3694 jQuery.fn.ready @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3882 jQuery.fn.init @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3050 jQuery.fn.init @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:10393 jQuery @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:98 (anonymous) @ load.php?debug=true&lang=en&modules=ext.gadget.PrimarySources&only=scripts&skin=vector&version=05jh4p0:126 16:08:37.822 load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3869 Uncaught TypeError: async.parallel is not a function at init (load.php?debug=true&lang=en&modules=ext.gadget.PrimarySources&only=scripts&skin=vector&version=05jh4p0:646) at HTMLDocument.<anonymous> (load.php?debug=true&lang=en&modules=ext.gadget.PrimarySources&only=scripts&skin=vector&version=05jh4p0:666) at mightThrow (load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3583) at process (load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3651) init @ load.php?debug=true&lang=en&modules=ext.gadget.PrimarySources&only=scripts&skin=vector&version=05jh4p0:646 (anonymous) @ load.php?debug=true&lang=en&modules=ext.gadget.PrimarySources&only=scripts&skin=vector&version=05jh4p0:666 mightThrow @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3583 process @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3651 setTimeout (async) jQuery.readyException @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3868 (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3888 mightThrow @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3583 process @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3651 setTimeout (async) (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3689 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3317 fireWith @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3447 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3455 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3317 fireWith @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3447 process @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3671 setTimeout (async) (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3689 fire @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3317 add @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3376 (anonymous) @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3709 jQuery.Deferred @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:10866 then @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3694 jQuery.fn.ready @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3882 jQuery.fn.init @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:3050 jQuery.fn.init @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:10393 jQuery @ load.php?debug=true&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin=vector&version=0xbrh4h:98 (anonymous) @ load.php?debug=true&lang=en&modules=ext.gadget.PrimarySources&only=scripts&skin=vector&version=05jh4p0:126