Node crashes when processing partial transaction

blindpsbt.cpp の 554 行目付近から始め、createpsbt を使って作成された dummy blinded output を使用して、提示された walletprocesspsbt ケースを再現します。値がゼロの output に対する blinding status と rangeproof failure を追跡し、その後、このトランザクションの回帰テストを追加または実行して、partial transaction の処理中に node が中断しなくなるようにします。

I made the node crash while trying to blind the following pset:

$ e1 walletprocesspsbt cHNldP8BAgQCAAAAAQMEAAAAAAEEAQEBBQEDAfsEAgAAAAABDiAqrJ9c31tcJHnWDjQWJNUfArZMJr1w1h7/S6GIMG31DwEPBAAAAAABEAT/////AAEEFgAUBFTPa7NoO3V+jzsjbmvRlQwcOWoBAwgA4fUFAAAAAAf8BHBzZXQCINMRFPznA5TB+dNUdQG0udNvQgI27GQZkVRWZDSIWs8tAAEEFgAU+a3P0cB6H1+r8pR099KXbz20PbwBAwgAAAAAAAAAAAf8BHBzZXQCICWyUQcOKcoZBDzzPM1zJOLdqwPsxK4LXnfE/A5c9slaB/wEcHNldAYhAv2YM9xdvR/Mxx+ulKcSzcom+JQpzsV/hrxKHexk7BYYB/wEcHNldAgEAAAAAAABBAABAwjoAwAAAAAAAAf8BHBzZXQCICWyUQcOKcoZBDzzPM1zJOLdqwPsxK4LXnfE/A5c9slaAA== false

The input of the tx is confidential and its amount is exactly 0.00001, therefore it's spent entirely by the fee out.
The first output of the tx is a non-LBTC unblinded one, therefore i tried to add a dummy LBTC blinded output to balance the tx as {"el1qqt7esv7utk73lnx8r7hfffcjeh9zd7y5988v2luxh39pmmryastp37ddelguq7slt74l99r57lffwmeaks7mc883qj7565fdg": 0, "blinder_index": 0} in createpsbt.

These are the last logs of the node:

2022-04-15T15:39:50Z [default wallet] AddToWallet 02338810e562a4fe99d555e616932f76dbb8301e9e264fcf6e9a3cf56ce5322d  new
2022-04-15T15:39:50Z [default wallet] AddToWallet 0ff56d3088a14bff1ed670bd264cb6021fd52416340ed679245c5bdf5c9fac2a  update
elementsd: blindpsbt.cpp:554: BlindingStatus BlindPSBT(PartiallySignedTransaction&, std::map<unsigned int, std::tuple<long int, CAsset, uint256, uint256> >, std::map<unsigned int, std::pair<CKey, CKey> >): Assertion `rangeresult' failed.

Seems like the blinder role fails to create a rangeproof for the dummy output. Am I doing something wrong?