We’re aware of this problem, which boils down to having the default bind of the use key in a water body assigned to drink. Our team is looking at workarounds for this to make interacting under the water a little less restrictive.
Thanks for your feedback.
If I have killed an NPC in shallow water and can get the preview window, but not open his inventory, I loot all from the window and drop what I don’t want.
After knocking out, say, a Cimmerian Berserker, and can see the body but not the interface, most of the time I can still tether him.
Thank you, @Ignasi for the feedback, and I appreciate the workaround tips, everybody. I have been operating in the highlands lately – it took about five days for me to notice, then see it repeat enough to know it’s a bug. Later I’ll post a screen grab I made last night: if you log out and then log back in, all the NPCs will be in T-Pose and easy to glean.