ArcGIS Field Maps Designer returns the error, "Features with true curves cannot currently be edited", even if the Supports TrueCurve option on the feature service is set to false.

Workaround

Turn off the option 'Only allow true curve updates by true curve clients' in the service settings. Note that this does mean if true curve features are edited in an application like ArcGIS Field Maps that does not support true curve editing, they will be replaced with non-true curve geometries. Consult with the data owner or end users if there is any uncertainty about this being acceptable.

For registered feature services:

• This setting can be unchecked from the item details page of the Feature Layer, or from ArcGIS Server Manager.

For hosted feature layers:

• Log in to the ArcGIS Server admin directory, navigate to services, Hosted, service name and Edit.
• Find all instances of the parameter 'onlyAllowTrueCurveUpdatesByTrueCurveClients' and set it to false if it is not already (there will be more than one).
• Find all instances of the parameter 'allowTrueCurvesUpdates' and set it to true if it isn't already (there will be more than one).
• Save edits to the service

Steps to Reproduce