I think I’ve solved the mystery.
The above test page works fine. But add a ui-only field to the StateWithoutObject model called “Id” and you can no longer update any field on the model’s rows at all.
I’ve changed my original page now (renamed my old UI field “Id” to “Id1”) and it’s back to its former happy self.
Yay! I have no hair left and my spirit is broken, but … yay!
