Removing the 'Service Desk Customer - Portal Access' from Create Issues permission prevents customers from viewing issues they reported

Summary

Customers are no longer able to view Customer Portal or their reported issues if the Service Desk Customer - Portal Access security type is not granted Create Issues permission in the Permission Scheme.

Steps to Reproduce

1. Create a Service Desk with default settings.
2. Add a few customers to the Service Desk, and let them create a few issues in the Customer Portal
3. Edit the Service Desk project's permission scheme so that "Service Desk Customer - Portal Access" security type is removed from the Create Issues permission.

Expected Results

Customers can no longer create new issues, but can still see existing issues they have reported.

Actual Results

• Customer portal disappears from help center list when viewed by customer.
• Customers can no longer see their previously reported open issues in the Customer Portal. Ofcourse as expected they are also unable to create new requests.
• My Requests section in Customer Portal doesn't show any issues reported by the Customer.

Notes

Strangely, the customer will still be able to see those issues by accessing the URL directly