Peer router vendor is not Juniper. Not sending NHTB payload for sa-cfg GT-ncb-ipsec-vpn_t10, p1_sa=7584821
Do you have another VPN tunnel also using the st0.0 interface?
NHTB (next hop tunnel binding) typically kicks in when you terminate more than one VPN on the same st0 sub interface. NHTB deteremines which tunnel to send the traffic into of the multiple applied there. This process is typically not compatible cross vendors.