I have had this happen several times tonight. I have attempted to mount a tree and seemingly fallen off. However when I hit the ground I cannot move and run in place. I have to hit circle twice to dismount the tree to fix it. However I am visible on the ground and have been gunned down as a result.
Tree mounting bug
I have had this happen several times. You drop down immediately after climbing a tree, and the game considers you to still be on the tree. You must tap twice to “drop down” from the tree in order to clear this bug.