Using a user picker custom field to grant the Create Issue permission doesn't allow users to create sub-tasks in the new issue view

Issue Summary

When adding a User custom field value to grant the Create Issue permission, the user cannot create sub-tasks in the new issue view. Jira displays the following error message:

Steps to Reproduce

1. Create a user picker custom field and add it to the create/edit/view screen of a software/SD project.
2. Grant the Create Issue permission to a User custom field value and choose the field created.
3. Go to an issue and pick a user using the field created (the user must not have this permission via a group/project role)
4. Ask the user to try to create a sub-task using the new issue view.

Expected Results

The user should be able to create the sub-task.

Actual Results

Jira displays the following error message and doesn't create the sub-task:

We couldn't create the sub-task
Check your connection, then give it another try

Workaround

Use the old issue view to create sub-tasks

OR

add this user to a group/project role that has the create issue permission in the project