hmm yeah I think maybe they broke and/or removed it. will ask around
try this;
after type%3D10 add %26sort%3Drandom and remove the &sort=random at the end
like @ https://app.plex.tv/desktop/#!/media/XXXXXX/com.plexapp.plugins.library?source=1&pivot=library&key=%2Flibrary%2Fsections%2F1%2Fall%3Ftype%3D10%26sort%3Drandom%26limit%3D200%26artist.genre!%3D2332%26and%3D1%26album.genre!%3D324%26and%3D1%26artist.genre!%3D324%26and%3D1%26track.lastSkippedAt%253C%253C%3D-1y%26and%3D1%26track.lastViewedAt%253C%253C%3D-2y&curatedKey=%2Fplaylists%2F9489&advancedFilters=1
it looks like the url is ‘url encoded’
you can convert the url to/from being ‘encoded’ @ URL Decoder/Encoder to kind of see how it used to be.
not sure if this change is intentional or when it happened, but url encoding makes it much more difficult to read from a user perspective.