Fixed on #25682

Summary of Changes

Fix broken submit if disabled fields are prefilled by comparing submitted value with the value filled before.

Testing Instructions

1. Create a custom field from the type media and disable the permission to edit custom field value for the group Manager.
2. Edit in backend the article with this custom field as a super user and as an example select an image.
3. Login in frontend with the user in the group Manager and edit the article with this custom field and safe it without any changes.

Expected result

The article will be submitted and saved.

Actual result

This will show a warning with invalid field.