While not a solution I will offer a potential workaround. Plex themselves have decided not to update the PMP for a long time which means it contains embedded web version 4.29.2 which pre dates any of the new wonderful stuff !
If you are using a pc you can ditch the current web ux and app and use this older PMP version. Yes it does not contain all the new ux stuff from plex but I’ll offer it as an alternative.
