Using legacy gatewayName format

Hi all brothers

I setup istio version 1.9.2 on GKE I don’t change any istio config affter setup but recently, I have get istio warming as beblow
Warning: using legacy gatewayName format “internal-gateway.istio-system.svc.cluster.local”; prefer the / format: “istio-system/internal-gateway” edited
I don’t know why istio has this warning

Please give me some advice