"Have you come to my house before?"

Translation: Sīrgō ñuho lentot umāzitā?

[ReinerSelb]

i just discovered in the wiki that the perfect of umāzigon is umāstan! so apparently we did it wrong all the time...

[Darellur]

It's more probable that the wiki is wrong since the course is made by the creator of the language and the wiki does not provide a source for that irregular conjugation.

[Ctxkh1Me]

I agree that the wiki should be considered incorrect - while Dedalvs could make a mistake in a single sentence, there are many examples of umāzitan and its fellows. However, the perfect stem of māzigon is mast-, which was known since 2013. I think that predates the Duolingo course. Since umāzigon is derived from māzigon, it was a reasonable assumption that they would have similar perfects - in fact, it's more interesting that they apparently don't!