### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current behaviour

crash

### Expected behaviour

no crash

### Steps to reproduce

* Compile 79e8247ddb166f9b980f40249b7372a502402a4d
* Type `migratewallet`

### Relevant log output

```
wallet/scriptpubkeyman.cpp:1915: std::optional<MigrationData> wallet::LegacyScriptPubKeyMan::MigrateToDescriptor(): Assertion `IsMine(desc_spk) != ISMINE_NO' failed.
Aborted (core dumped)
```


### How did you obtain Bitcoin Core

Compiled from source

### What version of Bitcoin Core are you using?

current master

### Operating system and version

Linux

### Machine specifications

_No response_
pubkeys.push_back(fullpubkey);
                }
            }
            for (const auto& pubkey : pubkeys) {
                std::unique_ptr<FlatSigningProvider> pk_keys = GetSigningProvider(pubkey);
                if (pk_keys) {
                    keys->Merge(std::move(*pk_keys));
                }
            }
        }
        SignPSBTInput(HidingSigningProvider(keys.get(), !sign, !bip32derivs), psbtx, i, &txdata, sighash_type, nullptr, finalize);
        bool signed_one = PSBTInputSigned(input);
        if (n_signed && (signed_one || !sign)) {
            
            
            
            (*n_signed)++;
        }
    }
    
    for (unsigned int i = 0; i < psbtx.tx->vout.size(); ++i) {
        std::unique_ptr<SigningProvider> keys = GetSolvingProvider(psbtx.tx->vout.at(i).scriptPubKey);
        if (!keys) {
            continue;
        }
        UpdatePSBTOutput(HidingSigningProvider(keys.get(), true, !bip32derivs), psbtx, i);
    }
    return TransactionError::OK;
}
std::unique_ptr<CKeyMetadata> DescriptorScriptPubKeyMan::GetMetadata(const CTxDestination& dest) const