I have this problem with Survey123 (mobile app) when often a custom AGOL map doesn't load when using a geopoint question.
The map has been added under "linked content", chosen under "map" and the map ID is added under body::esri:style ("map=xyz").
Sometimes it loads, sometimes not. I have to force restart the app it seems for it to work when it happens.
Any clue on what to check?
Thanks!