The test at https://github.com/openshift/cluster-ingress-operator/blob/master/test/e2e/gateway_api_test.go#L476-L508 is invalid.

Per discussions with Gateway API community (see https://issues.redhat.com/browse/NE-2125 and its comments on a recording about the question on Gateway API Listeners conflicts) two distinct Gateways having the same Listeners is supported and expected, as each Gateway may behave as an independent entity.

This way we need to remove the test above from our test suites.