After updating a Knative Service from YAML editor, the Edit Application form becomes Unusable

After updating a Knative Service from YAML editor, the Edit Application form becomes Unusable. The form is not allowing to submit as it required Image stream Tag from the internal registry, but is unable to find it.

4.14

Always

1. Install Serverless Operator and Knative Serving Instance
2. Create a sample Knative Service (From Search Page)
3. Go to the Knative Service YAML and change something.
3. Come to the Topology page and click Edit <app> from the Kebab menu of the Service.
4. Change the Runtime icon from the Drop-down list.
5. Try to submit.

The Submit button is disabled as it requires the internal regisry to be set first.

Instead of the Internal registry, the External registry option must be selected by default in the Edit form.