On two occasions I have transferred my bear to my boat, only to have it teleport into the air or under the water, then disappear. About 10 seconds later I receive a message that my bear has died.
I've now lost two bears to this bug, once last night, and again tonight.
Earlier today we had also lost a wolf for no apparent reason. We rode it into our pen (beside our other tames), then about 10 seconds later got a death message. No other tames were impacted, and there was no predators in the area.
Might be worth holding off on taming new animals until these bugs are fixed.