I suggest keeping an eye on the beta thread, and seeing if the TestFlight may be open. Unfortunately, it’s been a bit of a cat and mouse game as the stutter is sometimes fixed, but the fix breaks other necessary items. For instance, for a while there was no audio playback on iOS devices without headphones (which use the same client). Now the stutter has returned in some use cases, and a number of subtitle issues have been introduced. These are basic functionality items as well, and I can understand not wanting to push out an update that breaks other basic functions to fix another.
I do wonder if the new Plex App that was just announced may also make this text irrelevant.