I've run into an issue creating a line feature through Collector where I can create the feature in a 'live' mode in Collector when there aren't any offline areas for the map, but I cannot in an offline area. I receive the error: "the requested field was not found". I can confirm that I have properly provided all required fields in both cases. I can create features in that layer in ArcGIS Pro, ArcGIS Online Map Viewer, Collector if the map is live, but not Collector offline. I have had this happen in multiple maps, same layer. Other users of this layer report not having this problem.
Collector 20.2.2 Build 2847 iOS 14.3