Yep you read the title right. Luckily this happened on a test layer.
I created a very simple point layer with a related table, only a couple of text fields in each (built natively in AGOL, not published from Pro). Purpose was to be a sandbox layer for testing out Arcade expressions in Field Maps to hopefully replace a few Survey123 forms. Built a simple template in the Field Maps app page and tested a few calculated expressions (does it really not let you submit if a calculation fails? That's a no-go).
Well after submitting a point, I went into its web map viewer and clicked on "Forms" on the right-side panel. It acted like no form was built so I redid the template and saved. Soon as it went back to the web map, the point layer was throwing data errors. I haven't been able to access the feature layer since. Never seen a layer break like that before. Not a huge deal since I was just messing around, but does make me nervous about trying it in a production environment. Is there anything else that might have caused that?
