In a Requirement, the Execute with Sub-Test Execution option does not appear if there are required fields set

Description
In a Requirement, the Execute with Sub-Test Execution option does not appear if there are required fields set.

Pre-conditions

Set a Required field for the Sub-Test Execution issue type.

How to reproduce

1. Go to a Requirement
2. Click on Execute
3. The option with Sub-Test Execution is missing.

Actual result/Attachments

The option with Sub-Test Execution is missing.

Expected result

The option should appear.
Upon opening the Create Sub-Test Execution dialog, the required fields should be available to be filled.

Workaround:
Turn the field optional, or create a new Field Configuration scheme and associate with the Sub-Test Execution issue, turning the field optional.