diff --git a/source/gateway_httproute.go b/source/gateway_httproute.go
index eca0d690e9..e9e9b25ea9 100644
--- a/source/gateway_httproute.go
+++ b/source/gateway_httproute.go
@@ -31,9 +31,9 @@ func NewGatewayHTTPRouteSource(clients ClientGenerator, config *Config) (Source,
 	})
 }
 
-type gatewayHTTPRoute struct{ route *v1beta1.HTTPRoute }
+type gatewayHTTPRoute struct{ route v1beta1.HTTPRoute } // NOTE: Must update TypeMeta in List when changing the APIVersion.
 
-func (rt *gatewayHTTPRoute) Object() kubeObject               { return rt.route }
+func (rt *gatewayHTTPRoute) Object() kubeObject               { return &rt.route }
 func (rt *gatewayHTTPRoute) Metadata() *metav1.ObjectMeta     { return &rt.route.ObjectMeta }
 func (rt *gatewayHTTPRoute) Hostnames() []v1beta1.Hostname    { return rt.route.Spec.Hostnames }
 func (rt *gatewayHTTPRoute) Protocol() v1beta1.ProtocolType   { return v1beta1.HTTPProtocolType }
@@ -50,7 +50,14 @@ func (inf gatewayHTTPRouteInformer) List(namespace string, selector labels.Selec
 	}
 	routes := make([]gatewayRoute, len(list))
 	for i, rt := range list {
-		routes[i] = &gatewayHTTPRoute{rt}
+		// List results are supposed to be treated as read-only.
+		// We make a shallow copy since we're only interested in setting the TypeMeta.
+		clone := *rt
+		clone.TypeMeta = metav1.TypeMeta{
+			APIVersion: v1beta1.GroupVersion.String(),
+			Kind:       "HTTPRoute",
+		}
+		routes[i] = &gatewayHTTPRoute{clone}
 	}
 	return routes, nil
 }
diff --git a/source/gateway_tcproute.go b/source/gateway_tcproute.go
index 5badfaff12..687116c198 100644
--- a/source/gateway_tcproute.go
+++ b/source/gateway_tcproute.go
@@ -32,9 +32,9 @@ func NewGatewayTCPRouteSource(clients ClientGenerator, config *Config) (Source,
 	})
 }
 
-type gatewayTCPRoute struct{ route *v1alpha2.TCPRoute }
+type gatewayTCPRoute struct{ route v1alpha2.TCPRoute } // NOTE: Must update TypeMeta in List when changing the APIVersion.
 
-func (rt *gatewayTCPRoute) Object() kubeObject             { return rt.route }
+func (rt *gatewayTCPRoute) Object() kubeObject             { return &rt.route }
 func (rt *gatewayTCPRoute) Metadata() *metav1.ObjectMeta   { return &rt.route.ObjectMeta }
 func (rt *gatewayTCPRoute) Hostnames() []v1beta1.Hostname  { return nil }
 func (rt *gatewayTCPRoute) Protocol() v1beta1.ProtocolType { return v1beta1.TCPProtocolType }
@@ -53,7 +53,14 @@ func (inf gatewayTCPRouteInformer) List(namespace string, selector labels.Select
 	}
 	routes := make([]gatewayRoute, len(list))
 	for i, rt := range list {
-		routes[i] = &gatewayTCPRoute{rt}
+		// List results are supposed to be treated as read-only.
+		// We make a shallow copy since we're only interested in setting the TypeMeta.
+		clone := *rt
+		clone.TypeMeta = metav1.TypeMeta{
+			APIVersion: v1alpha2.GroupVersion.String(),
+			Kind:       "TCPRoute",
+		}
+		routes[i] = &gatewayTCPRoute{clone}
 	}
 	return routes, nil
 }
diff --git a/source/gateway_tlsroute.go b/source/gateway_tlsroute.go
index ec5de040e1..d889793e49 100644
--- a/source/gateway_tlsroute.go
+++ b/source/gateway_tlsroute.go
@@ -32,9 +32,9 @@ func NewGatewayTLSRouteSource(clients ClientGenerator, config *Config) (Source,
 	})
 }
 
-type gatewayTLSRoute struct{ route *v1alpha2.TLSRoute }
+type gatewayTLSRoute struct{ route v1alpha2.TLSRoute } // NOTE: Must update TypeMeta in List when changing the APIVersion.
 
-func (rt *gatewayTLSRoute) Object() kubeObject           { return rt.route }
+func (rt *gatewayTLSRoute) Object() kubeObject           { return &rt.route }
 func (rt *gatewayTLSRoute) Metadata() *metav1.ObjectMeta { return &rt.route.ObjectMeta }
 func (rt *gatewayTLSRoute) Hostnames() []v1beta1.Hostname {
 	return v1b1Hostnames(rt.route.Spec.Hostnames)
@@ -55,7 +55,14 @@ func (inf gatewayTLSRouteInformer) List(namespace string, selector labels.Select
 	}
 	routes := make([]gatewayRoute, len(list))
 	for i, rt := range list {
-		routes[i] = &gatewayTLSRoute{rt}
+		// List results are supposed to be treated as read-only.
+		// We make a shallow copy since we're only interested in setting the TypeMeta.
+		clone := *rt
+		clone.TypeMeta = metav1.TypeMeta{
+			APIVersion: v1alpha2.GroupVersion.String(),
+			Kind:       "TLSRoute",
+		}
+		routes[i] = &gatewayTLSRoute{clone}
 	}
 	return routes, nil
 }
diff --git a/source/gateway_udproute.go b/source/gateway_udproute.go
index 20ce5ccc43..c8466821aa 100644
--- a/source/gateway_udproute.go
+++ b/source/gateway_udproute.go
@@ -32,9 +32,9 @@ func NewGatewayUDPRouteSource(clients ClientGenerator, config *Config) (Source,
 	})
 }
 
-type gatewayUDPRoute struct{ route *v1alpha2.UDPRoute }
+type gatewayUDPRoute struct{ route v1alpha2.UDPRoute } // NOTE: Must update TypeMeta in List when changing the APIVersion.
 
-func (rt *gatewayUDPRoute) Object() kubeObject             { return rt.route }
+func (rt *gatewayUDPRoute) Object() kubeObject             { return &rt.route }
 func (rt *gatewayUDPRoute) Metadata() *metav1.ObjectMeta   { return &rt.route.ObjectMeta }
 func (rt *gatewayUDPRoute) Hostnames() []v1beta1.Hostname  { return nil }
 func (rt *gatewayUDPRoute) Protocol() v1beta1.ProtocolType { return v1beta1.UDPProtocolType }
@@ -53,7 +53,14 @@ func (inf gatewayUDPRouteInformer) List(namespace string, selector labels.Select
 	}
 	routes := make([]gatewayRoute, len(list))
 	for i, rt := range list {
-		routes[i] = &gatewayUDPRoute{rt}
+		// List results are supposed to be treated as read-only.
+		// We make a shallow copy since we're only interested in setting the TypeMeta.
+		clone := *rt
+		clone.TypeMeta = metav1.TypeMeta{
+			APIVersion: v1alpha2.GroupVersion.String(),
+			Kind:       "UDPRoute",
+		}
+		routes[i] = &gatewayUDPRoute{clone}
 	}
 	return routes, nil
 }