Not sure if this is a known bug, but I can’t find anything on it. I ran into an invisible tree trunk on a forest trail.
https://photos.google.com/u/1/photo/AF1QipMoYEe5VCyWUhfCuTboUx4JX7_EXriL9cr7Yb_U
Win 10 x64, Game Version 0.D-1027ge0c9fb5 & Build 8664 w/ Tiles (LivePeople)