I have an outbound channel with an BTC to Lightning exchange worth 2.000.000 satoshi, with enough capacity. I try to swap my 2.000.000 satoshi for the same amount, but on-chain. Lightningd splits the payment into too many subpayments, and eventually fails, even though the destination is only one hop away, and has enough capacity.
I just wrote
pay bolt11, no extra parameters. I can probably wait for #3917 before attempting any more pays. I've sent you guys some logs.