I've looked into it and I don't know what I could do to fix it. The problem is that the game is saying that the Rift is unloaded when it really isn't :/
The problem isn't the size of the Rift or bots thinking that it should be the same as the others, it's that the game is telling them that it's no longer there and has despawned :/
You could have it search for a string. Have it right click the coords around the rift at random, nearest either or so that it has human like interaction then search the menu for the corresponding div functions. I'm not much into scripting but a know a tad bit. But I'm not sure what so ever what you do with the codes you run through. They're just thoughts.