After an option to change player height was removed from Desktop mode, default player height for Desktop users is fixed at a value of 1.675 metres. This causes the bug with small avatars (less than about 0.9 metres in height): when you pick up anything, the arm doesn't pull forward. It stays down like you aren't holding anything, or, if height is near to 0.9, only hand rotates forward. If you change default player height to about 0.7 on desktop, the bug doesn't appear, the arm pulls like it is supposed to.
Steps: Take any avatar that has height less than 0.9 (better 0.8) height and pick up anything (markers/eraser in home, etc)
Version: any (Tested on 840-845)