Bear disappears/goes invisible

[frunsi]

So I was playing on Mystery Lake earlier, and after having set up my base and found a good amount of weaponry and ammunition I decided to clear the area of the bear usually found hanging out by the Trapper's Homestead. I got my rifle ready and walked up to the bear until he recognized my presence and started approaching me. I was in the process of lining up a sweet headshot when suddenly the bear was no more, disappeared without a trace. Massively creeped out, thinking the bear might have gained invisibility powers and was still charging at me, I ran off as fast as I could. However, I did not hear bear sounds anymore.

Is it a common/known issue that bears randomly disappear?