Fix custom default backend switch to default (#4611)
Fix custom default backend switch to default (#4611)


canhnt/ingress,kubernetes/ingress-nginx,kubernetes/ingress-nginx,kubernetes/ingress-nginx,caicloud/ingress,canhnt/ingress,aledbf/ingress-nginx,aledbf/ingress-nginx,kubernetes/ingress-nginx,caicloud/ingress,caicloud/ingress,caicloud/ingress,aledbf/ingress-nginx,aledbf/ingress-nginx,kubernetes/ingress-nginx,canhnt/ingress,canhnt/ingress