Reproduce steps :

1. Create a document type with a nested list of another document type
2. Make some fields of the nested document type mandatory.
3. Try to add the document type with nested list of another document type to the website. Ignore some mandatory fields of the nested document type and tap on the submit button, validation errors about the nested type mandatory fields and "Property is invalid" error should be displayed.
4. Try to fix all validation errors by filling all mandatory fields. Tap on the submit button

Expected behaviour : As you filled all mandatory properties of the nested document type, property should be valid and be saved

Actual behavior : All validation errors about the nested document type has gone, but the "Property is invalid" error is shown(but property IS valid), and submit button doesn't work and doesn't send any requests.

Looks like the issue is on the frontend size, can you try reproducing this bug?

Umbraco version - 8.13.0