### 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_
{
    AssertLockHeld(cs_desc_man);
    assert(!m_storage.IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS));
    
    if (m_map_keys.find(pubkey.GetID()) != m_map_keys.end() ||
        m_map_crypted_keys.find(pubkey.GetID()) != m_map_crypted_keys.end()) {
        return true;
    }
    if (m_storage.HasEncryptionKeys()) {
        if (m_storage.IsLocked()) {
            return false;
        }
        std::vector<unsigned char> crypted_secret;
        CKeyingMaterial secret(key.begin(), key.end());
        if (!EncryptSecret(m_storage.GetEncryptionKey(), secret, pubkey.GetHash(), crypted_secret)) {
            return false;
        }
        m_map_crypted_keys[pubkey.GetID()] = make_pair(pubkey, crypted_secret);
        return batch.WriteCryptedDescriptorKey(GetID(), pubkey, crypted_secret);
    } else {
        m_map_keys[pubkey.GetID()] = key;
        return batch.WriteDescriptorKey(GetID(), pubkey, key.GetPrivKey());
    }
}
bool DescriptorScriptPubKeyMan::SetupDescriptorGeneration(const CExtKey& master_key, OutputType addr_type, bool internal)
{
    LOCK(cs_desc_man);
    assert(m_storage.IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
    
    if (m_wallet_descriptor.descriptor) {