Hey so basically Ive narrowed it down i think, when players leave the 12342 region (edge) and go in to wildy and teleport out (While being in another part of the wilderness that isnt inside the region 12342) they become invisible to the other players when they teleport back home.
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In this gyazo i have 3 clients. the bottom middle client is the player that has gone invisible . The other 2 clients cant see him.
Offtopic: my discord is filled with messages and Im back in the rsps scene now and I will be paying u back for that loan.
Edit: I dont think its just teleporting... Sometimes i just have to leave the region and come back. Also when the invisible player relogs it does not help. they stay invisible. The players who cannot see the invisible person must relog to see them