I have created a web map in ArcGIS Online that is using a Continuous Color style based on the last_edit_date system field. The use case here is that I need to field verify some data but want to make sure that I'm going to the sites that were updated least recently first.
Here is what I have in AGO:

And this is what I see in Field Maps:

I am using Field Maps 26.1.1 Build 2542 on an 5th generation iPad Pro.