unused/hidden read-only prefill fields trigger error

[LaurensBurger]

Product versie / Product version

3.x.x

Customer reference

DH, 's-Hertogenbosch

Omschrijf het probleem / Describe the bug

When a form has multiple field sets for a "uw-gegevens" step e.g:

• DigiD
• eHerkenning
• Anon

And these field sets are hidden and the fields within (being dedicated for pre fill) are disabled: Trigger the "Je mag de prefill-gegevens niet wijzigen" error on "validate" call.

In this case the prefill did not return any value, and the field set is hidden because the user started the form with another authentication plugin.

As the fields that do not pass validation are not prefilled at all this should not occur.

Stappen om te reproduceren / Steps to reproduce

Form 749 on maykin test.
Start the form anonymous
Select: "Persoon"
Fill in fields and try to navigate to the next step.
See "validate" request.

Verwacht gedrag / Expected behavior

No response

Screen resolution

None

Device

None

OS

None

Browser

No response