Here is what I found has broken in Creative since the UEFN release:
-4 hr server time has been re-introduced. This breaks all ongoing games as it ends the server abruptly.
-Barriers that toggle cannot be stepped on by players. This was an old bug that was fixed in Creative.
-Player contact in trick tiles (v1) doesn’t work anymore.
-Movers cause vehicles that step on them to jitter and not move.
-Some assets are invisible in some platforms, and cause the player to jitter (not sure if its a new issue, but I recently got the report)
(if you have found more issues, lmk to add to this list)