When character has been attached with something, e.g. I attached sunglasses to avatar, it transferred into unreal engine via live link, but activating link does nothing to show up in subject role window of livelink source of unreal engine 5.2 and 5.6. And all other assets stop show up in there together with attaching character.
Detaching makes all process works normal.

After I roll back Iclone into V 8.65 the issue was gone.