Will check this later, not sure if I'd hit it once after felling or several times but I just stood there looking at the bottom of the tree (in the first image) and the square texture cycled through various versions, changing every second or so.
Haven't been able to replicate this so I'd ignore it for now. Will repost if it happens again.
 
		 
		
		
	 
			
									
		


 Or more precisely, it looks like there is a desync between client and server time... if the time diff is too great, the game updates the sun position immediately (most likely this is what you're seeing here - this also becomes visible on the sun reflection)...
  Or more precisely, it looks like there is a desync between client and server time... if the time diff is too great, the game updates the sun position immediately (most likely this is what you're seeing here - this also becomes visible on the sun reflection)...


 
 







 Merry Christmas!
  Merry Christmas!