I just had a quick test and the skipping (on track advance or seeking) happens nearly all the time, very annoying (if you need it).I have no idea about other UPnP renderers generally. I have a couple that work well with LMS Bridge and a couple that won’t work at all. The only one I actually use is the WiiM.
I proxied the WiiM to a DLNA renderer using BubbleUPnP Server and then played to that using LMS and it's MUCH more usable, even seeking seems to work, or at least the track plays from the new position even though the WiiM app and LMS eventually lose track progress, but the next track does play correctly.