When playing with friends on the newest version (1.15.5) we came across a slight problem.
Occasionally the game would lag (We expected it to because on of our friends are playing in the US and we are in Canada, it happens with most games) and when the lag would happen, the character would become stuck in it's place but the player could still move around (Only shown by their name tag)
We figured out two temporary solutions for this problem:
The invisible player leaves the game and re-joins.
We turn down the graphics (Causes less lag)
I just thought people should know, it happened a few times when we were playing but only when it lagged.