This could be intended behaviour, but I don’t know. In my menu, I use a part with a surfacegui infront of a billboardgui Thing is, until (relatively) recently, this wasn’t a problem, but now the surfacegui doesn’t appear anymore. I heard of a recent billboardGui update, maybe this was a feature of that?
.AlwaysOnTop has no effect on this, it behaves this way on both. I hope this isn’t intended, since it broke my nice achievement gui. 