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triggered a payment forwarding. Final onions may trigger a payment forwarding, through the callback returned by maybe_fulfill_htlc. In that case, we should not fail the HTLC later; doing so might result in fund loss. Remove test_simple_payment_with_hold_invoice_timing_out: once we have accepted to forward a payment HTLC with a hold invoice, we do not want to time it out, for the same reason.