not_blank_constraint_rule fail on fields with multiple values

Problem/Motivation

Validation is only triggerd on the first field, but not on others that are not filled.

1. I have a field that is limited to two values.
2. If not both field are filled the form - validation need to trigger a form error

This worked with "required" validator in D7 and is not working in D10 with not_blank_constraint_rule field validation in 3.0.0-beta3. As the required rule cannot configured anymore I need to find a solution.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes