Problem:
When a content type references a paragraph entity with required subfields, submitting the form without filling the required subfields does NOT trigger validation errors as expected. The RequiredApiFormErrorHandler mistakenly clears these errors because it fails to parse nested field paths (e.g., field_content_section][1][subform][field_text][0][value).
Impact:
Required subfields in paragraphs can be left empty without validation.
Data integrity is compromised for entities relying on paragraph validation.
Steps to Reproduce
Install the Required API module.
Create a paragraph type Text Paragraph with a required text field field_text.
Create a content type Article with a paragraph reference field field_content_section (pointing to Text Paragraph).
Create an Article node:
Add a Text Paragraph to field_content_section.
Leave field_text empty.
Save the node.
Expected Result:
Validation error displays: "field_text field is required."
Actual Result:
Node saves successfully without errors.
Active
3.0
Code
@davis zhou thanks for your contribution! It fixes the issue for me. I just have one question, I left it in the MR.
Issue #3520637 by dieterholvoet, davis zhou: Validation errors for...