Steps to reproduce on regtest:

```
converttopsbt 02000000000101ab73dba46508bacdb49a988ddd74bc9d39c9cb7e057af060ca8c6b6861e28e3c0300000000feffffff02b828d0b20000000017a914d1954862afd728fbb055149002958e1d1b9e1f0b8700ca9a3b0000000017a91442170ccb3441cff1723af9afab6f2553103e1d578702473044022077380c6e16496d9905aef120694c329be51522847cb5d53fa74b94698c95678d02202d32c46e0e17420a83dee830fefda7d40529182f5d82be47c2b49a7b83214ab50121026d483d6628dcc3ef6e3ab9ed4937c452c263c7e0ac80eb4be97426d5da8f640500000000
```
or 
```
converttopsbt 02000000000101ab73dba46508bacdb49a988ddd74bc9d39c9cb7e057af060ca8c6b6861e28e3c0300000000feffffff02b828d0b20000000017a914d1954862afd728fbb055149002958e1d1b9e1f0b8700ca9a3b0000000017a91442170ccb3441cff1723af9afab6f2553103e1d578702473044022077380c6e16496d9905aef120694c329be51522847cb5d53fa74b94698c95678d02202d32c46e0e17420a83dee830fefda7d40529182f5d82be47c2b49a7b83214ab50121026d483d6628dcc3ef6e3ab9ed4937c452c263c7e0ac80eb4be97426d5da8f640500000000 false
```

Further reading: #13738
}
    result.pushKV("unknown", unknowns);
    
    CAmount total_in = 0;
    bool have_all_utxos = true;
    UniValue inputs(UniValue::VARR);
    for (unsigned int i = 0; i < psbtx.inputs.size(); ++i) {
        const PSBTInput& input = psbtx.inputs[i];
        UniValue in(UniValue::VOBJ);
        
        if (!input.witness_utxo.IsNull()) {
            const CTxOut& txout = input.witness_utxo;
            UniValue out(UniValue::VOBJ);
            out.pushKV("amount", ValueFromAmount(txout.nValue));
            total_in += txout.nValue;
            UniValue o(UniValue::VOBJ);
            ScriptToUniv(txout.scriptPubKey, o, true);
            out.pushKV("scriptPubKey", o);
            in.pushKV("witness_utxo", out);
        } else if (input.non_witness_utxo) {
            UniValue non_wit(UniValue::VOBJ);
            TxToUniv(*input.non_witness_utxo, uint256(), non_wit, false);
            in.pushKV("non_witness_utxo", non_wit);
            total_in += input.non_witness_utxo->vout[psbtx.tx->vin[i].prevout.n].nValue;
        } else {
            have_all_utxos = false;
        }
        
        if (!input.partial_sigs.empty()) {
            UniValue partial_sigs(UniValue::VOBJ);