Currently, as it was in locraw, the ClientboundLocationPacket simply shows "Private Island" when on a player's island, whether that is an island that the player is a part of, or someone else's island. Ideally I would like to write some behaviour that changes based on whether the island is the player's or someone else's, but the owner isn't trivial to detect, especially as longer names can be cut off in the tab list. At the moment, the best workaround is to detect the scoreboard text for "Your Island", but that doesn't provide the ownership information for other players' islands, nor does it work on garden - all gardens show as "The Garden".

The ideal solution would be, for example, a list of all of the coop members on the current private island, but as I'm unsure where that would fit best, a field denoting the profile id or whether the player is a part of the island would be a great substitute. The same field would also apply to the garden.