Hi, I've looked through the Bugs List. Couldn't find anywhere if it was already posted, so I'll post it.

When you load up a P43 map in your Tribehouse, bafflua, utility or any other minigame where you can load up maps, you will get disconnected when you load up the next map, I don't know why this bug happens, it's just very annoying. I got 2 P43 maps, and if I play them with friends we all get disconnected.

~ Dadio

I'm pretty sure its cuz theres no hole (which is how it detects its P43 and those others). Add a hole offscreen and it SHOULD work.
But dont take my word on that

Oh sorry, I got this confused with those 3 map kinds that utility cant run yet (P22 or something is one of them), which doesnt work on utility

Couldn't get on transformice at the time before, and forgot I posted -_-

It loads map 0 just after you play another map. After a few second you'll disconnect.

I don't know if you were talking to me or to Defilantegod, Bolinboy.