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Seems expected for tunnel mode, from code of kernel. xfrm_input

xfrm_input
....
     if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
         decaps = 1;
         break;
     }
....
    if (decaps) {
        if (skb->sp)
            skb->sp->olen = 0;
        skb_dst_drop(skb);
        gro_cells_receive(&gro_cells, skb);
        return 0;