signpsbt should be able to derive the scriptPubKey and witness script given only the txin hash and vout

[matvore]

wallet-tool.py signpsbt requires the scriptPubKey and apparently the witness script (for fidelity bond utxos) in the PSBT input maps.

When you create a PSBT with Bitcoin Core's createpsbt, you can only set the txin hash and vout values, so creating a psbt for signpsbt requires some specialized tool or script.

Let me know if you need more detailed repro steps. Any suggested workaround would be appreciated.