Sitecore 9.2.0, I have created a
custom field, based on the relevant tutorial (https://doc.sitecore.com/developers/92/sitecore-experience-manager/en/walkthrough--creating-a-custom-rating-element-with-property-editor.html).
When I try to add this field into a form via the Forms UI, I see in the network tab that the relevant API call fails with a status code of 400 (bad request). All OOTB fields work fine. Sitecore logs report absolutely nothing, event viewer reports absolutely nothing.
I am obviously missing something. Any insights on where to look?