Project owner blocked from editing project policies when assigned a custom role

When following these steps:

1. Create a group
2. Create a custom role starting with Guest and add the manage_security_policy_link permission
3. Add a project and a owner for the project
4. The owner enables one of the Policies rules from Secure/Policies
5. Assign the project owner at group level the custom role created at step 2
6. As the project owner try to edit the existing policies or add a new one

The user is returned The user does not have a permission to create a policy.

This prevents the project owner from being able to edit the project's policies, assigning a project owner a custom role should not block them from managing the project's policies.