cheat TP K12 69139 -494741 681
Earlier today I was riding around on my bear, Misha, and hopped off to gather some things. When I tried to hop back on him, all I could do was access his inventory. I chopped some trees down around him, thinking he might be stuck on something and that's why I couldn't mount him again. After I cut a few down, he sank through the floor and I can no longer access him at all. By using 'K' I can tilt the camera down and see him swimming around ( https://i.imgur.com/v6LO3rx.png ) but he will not respond to any of my whistles, so I can't guide him to a body of water which I would assume allow him to go back onto land.
Update: Misha died, may he rest in peace. Hopefully no other tames suffer his fate.