According to https://mowicpopolsku.com/polish-grammar/cases/locative/#masculine-singular this is indeed an exception.
Fun fact: Domie used to be an alternative locative form of domu, but it's extremely rare nowadays. You might find it in texts that are written intentionally in an archaic style.
I could find an example in Andrzej Sapkowski's Narrenturm (2002):
W joannickim domie cię nie najdą, a w drodze tamój nie będziesz sam.