Cassianno I'm sorry I didn't understand properly. Do you mean you confirm it's not working as intended? Or that you had no problem with it and the square was hiding when a character is moving and displaying when not moving. If it's the latter, did you try to move both characters? I think only one of them who has the highest UID causes the issue.
Yeah, the way i tested it worked as supposed ("no bug"). I don't remember if i tried with both characters tho, maybe i tried only with the lowest UID one.
Anyway, the other thread linked before indeed proves that there's a bug.