Saving a field without DEO in a webview fails

[JimmyH]

Is this fixed i 18.2, or am I missing a property?

If I set field_changed_value on a field that's not in the webview, the field is blank after a save.
If I add a webform to the webview with the field and set pbrender to false, the field is saved as expected.

What do I do?

Thanks in advance
Jimmy