Why Cannot I Select the Corresponding Service When Adding a Route?

During adding a route, the target service is filtered based on the corresponding gateway protocol. The filtering rules are as follows:

• For an HTTP gateway, select an HTTP service.
• For a TCP gateway, select a TCP service.
• For a gRPC gateway, select a gRPC service.
• For an HTTPS gateway, select either an HTTP or a gRPC service.
• For a TLS gateway which TLS termination is enabled, select a TCP service. If TLS termination for a TLS gateway is disabled, select a TLS service.