So I ran into an issue with the new collector app (v19.1) where features from certain layers are not showing up on the map. They display just fine on my PC as well as in the classic collector app.
I republished the service, re-created the online map, but still no success. They are not displaying on the map.
The only workaround I figured out is to put a filter on the layer when creating the online map. As soon as there's a filter on the layer, the features are displaying in the new Collector version.
Did I just found a bug or what am I missing here?