Customers have reported that the AFT streaming Juniper prefix, when pointing to a non-LSP, is displaying as blank, which causes problems in Synapse. Logs from the Pictor connected to the MX running Junos version 20.3X75-D52 as below
/openconfig/network-instances/network-instance/DEFAULT/afts/next-hops/next-hop/5/interface-ref/state/subinterface, 0` /openconfig/network-instances/network-instance/DEFAULT/afts/next-hops/next-hop/5/state/lsp-nam