for issue#2196 (#2197)

for issue#2196

oap-server/server-receiver-plugin/skywalking-register-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/register/provider/handler/v6/grpc/RegisterServiceHandler.java

@@ -94,6 +94,7 @@ public class RegisterServiceHandler extends RegisterGrpc.RegisterImplBase implem
                 switch (key) {
                     case HOST_NAME:
                         instanceProperties.addProperty(HOST_NAME, property.getValue());
+                        break;
                     case OS_NAME:
                         instanceProperties.addProperty(OS_NAME, property.getValue());
                         break;