Not really a visual glitch and you can't make it in the actual game and that's problematic. It's possible to make something in the game that seems like a teleporter, but it needs a bit of mechanic and it can't be done with yellow bots (in game builder), but it tricked me anyways lol
Right, it's one way. (I can't say how to make it in another way.) But you don't need to make two B bots - you can make a transformation! Just in one place (for example) place B Bot, then in another place R bot.