All control plane packets do not see the LDP shortcut route entry in RTM with the exception of the following control packets, which are forwarded over an LDP shortcut when enabled:
A locally generated or in transit ICMP ping and trace route of an IGP route. The transit message appears as a user packet to the ingress LER node.
A locally generated response to a received ICMP ping or trace route message.
All other control plane packets that require an RTM lookup and knowledge of which destination is reachable over the LDP shortcut continues to be forwarded over the IP next-hop route in RTM.