I had this same issue and just found a cause. In my situation, the feature layer was published to ArcGIS Online by sharing as a web layer from ArcGIS Pro, and whichever field was chosen as the 'Display Field' at the time of sharing, that same field did not have the 'Create List' option available on ArcGIS Online. I changed the 'Display Field' to OBJECTID in ArcGIS Pro and re-published, which solved the issue.
I you want to apply this fix but have already made changes to the existing feature layer, or have created/edited features, you could try exporting the feature service to a FGDB, changing the 'Display Field' in ArcGIS Pro, then overwriting the web layer. I tested this out and it worked as well.
If your web layer was not published to ArcGIS Online by sharing as a web layer from ArcGIS Pro, then the 'Create List' issue is most likely related to the visualization settings.