Bulk Edit URL error

So, I select two posts to bulk edit and add the category “non-fiction” to them both and hit enter.

My server then gives me a 414 error i.e. the URL is waaay too long.

You’re telling me. Check this out:

https://johnandsheena.co.uk/books/wp-admin/edit.php?s=&mode=list&action=edit&_wpnonce=6c9910d339&_wp_http_referer=%2Fbooks%2Fwp-admin%2Fedit.php&m=0&cat=0&notags=0&btm-global-tags=&post_category[]=351&tags_input=&comment_status=&ping_status=&_status=-1&sticky=-1&bulk_edit=Update+Posts&post_view=list&oldtags-735=&oldtags-735=&oldtags-152=&oldtags-152=&oldtags-1174=&oldtags-1174=&oldtags-1169=&oldtags-1169=&oldtags-1156=7+(excellent)%2C+non-fiction%2C+religion&oldtags-1156=7+(excellent)%2C+non-fiction%2C+religion&oldtags-931=5+(good)&oldtags-931=5+(good)&oldtags-938=4+(okay)&oldtags-938=4+(okay)&oldtags-1133=4+(okay)%2C+uk&oldtags-1133=4+(okay)%2C+uk&oldtags-1130=4+(okay)%2C+uk&oldtags-1130=4+(okay)%2C+uk&oldtags-1095=non-fiction&oldtags-1095=non-fiction&oldtags-1080=5+(good)%2C+non-fiction&oldtags-1080=5+(good)%2C+non-fiction&oldtags-1082=7+(excellent)%2C+non-fiction&oldtags-1082=7+(excellent)%2C+non-fiction&oldtags-1067=7+(excellent)%2C+uk&oldtags-1067=7+(excellent)%2C+uk&oldtags-936=uk&oldtags-936=uk&oldtags-1065=5+(good)&oldtags-1065=5+(good)&oldtags-940=&oldtags-940=&oldtags-826=non-fiction&oldtags-826=non-fiction&post[]=892&oldtags-892=7+(excellent)&oldtags-892=7+(excellent)&post[]=872&oldtags-872=4+(okay)&oldtags-872=4+(okay)&oldtags-848=5+(good)%2C+uk&oldtags-848=5+(good)%2C+uk&oldtags-925=7+(excellent)%2C+non-fiction&oldtags-925=7+(excellent)%2C+non-fiction&oldtags-824=4+(okay)&oldtags-824=4+(okay)&oldtags-927=7+(excellent)%2C+non-fiction&oldtags-927=7+(excellent)%2C+non-fiction&oldtags-832=4+(okay)&oldtags-832=4+(okay)&oldtags-794=&oldtags-794=&oldtags-923=4+(okay)%2C+non-fiction&oldtags-923=4+(okay)%2C+non-fiction&oldtags-921=non-fiction%2C+uk&oldtags-921=non-fiction%2C+uk&oldtags-919=6+(very+good)%2C+non-fiction&oldtags-919=6+(very+good)%2C+non-fiction&oldtags-717=5+(good)%2C+uk&oldtags-717=5+(good)%2C+uk&oldtags-899=4+(okay)&oldtags-899=4+(okay)&oldtags-716=7+(excellent)&oldtags-716=7+(excellent)&oldtags-897=5+(good)&oldtags-897=5+(good)&oldtags-715=6+(very+good)%2C+uk&oldtags-715=6+(very+good)%2C+uk&oldtags-693=6+(very+good)&oldtags-693=6+(very+good)&oldtags-695=7+(excellent)%2C+uk&oldtags-695=7+(excellent)%2C+uk&oldtags-678=4+(okay)&oldtags-678=4+(okay)&oldtags-672=&oldtags-672=&oldtags-663=4+(okay)&oldtags-663=4+(okay)&oldtags-655=uk&oldtags-655=uk&oldtags-624=4+(okay)&oldtags-624=4+(okay)&oldtags-623=7+(excellent)&oldtags-623=7+(excellent)&oldtags-612=5+(good)&oldtags-612=5+(good)&oldtags-604=5+(good)&oldtags-604=5+(good)&oldtags-590=non-fiction&oldtags-590=non-fiction&oldtags-494=5+(good)%2C+non-fiction%2C+religion&oldtags-494=5+(good)%2C+non-fiction%2C+religion&oldtags-486=5+(good)%2C+uk&oldtags-486=5+(good)%2C+uk&oldtags-469=4+(okay)&oldtags-469=4+(okay)&oldtags-467=6+(very+good)&oldtags-467=6+(very+good)&oldtags-465=4+(okay)%2C+indonesia&oldtags-465=4+(okay)%2C+indonesia&oldtags-456=7+(excellent)%2C+uk&oldtags-456=7+(excellent)%2C+uk&oldtags-448=&oldtags-448=&oldtags-435=4+(okay)&oldtags-435=4+(okay)&oldtags-420=&oldtags-420=&oldtags-412=5+(good)&oldtags-412=5+(good)&oldtags-400=5+(good)&oldtags-400=5+(good)&oldtags-385=&oldtags-385=&oldtags-383=6+(very+good)&oldtags-383=6+(very+good)&oldtags-374=5+(good)&oldtags-374=5+(good)&oldtags-368=5+(good)&oldtags-368=5+(good)&oldtags-357=5+(good)&oldtags-357=5+(good)&oldtags-337=5+(good)&oldtags-337=5+(good)&oldtags-327=7+(excellent)&oldtags-327=7+(excellent)&oldtags-287=5+(good)&oldtags-287=5+(good)&oldtags-283=&oldtags-283=&oldtags-271=6+(very+good)&oldtags-271=6+(very+good)&oldtags-262=7+(excellent)&oldtags-262=7+(excellent)&oldtags-255=7+(excellent)&oldtags-255=7+(excellent)&oldtags-258=4+(okay)&oldtags-258=4+(okay)&oldtags-235=Uncategorized&oldtags-235=Uncategorized&oldtags-230=&oldtags-230=&oldtags-225=7+(excellent)&oldtags-225=7+(excellent)&oldtags-220=6+(very+good)&oldtags-220=6+(very+good)&oldtags-215=&oldtags-215=&oldtags-185=6+(very+good)&oldtags-185=6+(very+good)&oldtags-179=&oldtags-179=&oldtags-170=6+(very+good)&oldtags-170=6+(very+good)&oldtags-151=4+(okay)&oldtags-151=4+(okay)&oldtags-150=5+(good)&oldtags-150=5+(good)&oldtags-148=6+(very+good)&oldtags-148=6+(very+good)&oldtags-149=7+(excellent)&oldtags-149=7+(excellent)&oldtags-147=7+(excellent)&oldtags-147=7+(excellent)&oldtags-146=&oldtags-146=&oldtags-145=7+(excellent)&oldtags-145=7+(excellent)&oldtags-144=4+(okay)%2C+uk&oldtags-144=4+(okay)%2C+uk&oldtags-143=5+(good)&oldtags-143=5+(good)&oldtags-142=5+(good)&oldtags-142=5+(good)&oldtags-141=&oldtags-141=&oldtags-140=4+(okay)&oldtags-140=4+(okay)&oldtags-139=5+(good)&oldtags-139=5+(good)&oldtags-136=&oldtags-136=&oldtags-137=&oldtags-137=&oldtags-135=5+(good)&oldtags-135=5+(good)&oldtags-134=7+(excellent)&oldtags-134=7+(excellent)&oldtags-133=4+(okay)&oldtags-133=4+(okay)&oldtags-132=5+(good)&oldtags-132=5+(good)&oldtags-131=6+(very+good)&oldtags-131=6+(very+good)&oldtags-130=&oldtags-130=&oldtags-129=4+(okay)&oldtags-129=4+(okay)&oldtags-128=religion%2C+uk&oldtags-128=religion%2C+uk&oldtags-127=7+(excellent)&oldtags-127=7+(exce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That is some URL.

It seems to consist of repeated uses of tags.

I wonder if this is linked to this error: I converted my categories to tags using the category converter plugin. After I realised that categories were more for me, I converted them back again.

Any ideas how to get this working properly?