Object only visible to some players?

Yes, a few devices are able to do this. 2 off the top of my head…

Collectible objects when set to consume by Self, will show each player only the objects that player has collected.

Conditional buttons can be set to interactions per player.

A lot of devices have class or team settings, so only players of that class and team are effected. by changing a players class on interaction, you can change what they are able to access.

Maybe even a small barrier with an opaque material could be used, removing the player from ignore list or changing thier class to hide an object behind.