### 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_
{
    LOCK(cs_desc_man);
    std::unordered_set<CScript, SaltedSipHasher> script_pub_keys;
    script_pub_keys.reserve(m_map_script_pub_keys.size());
    for (auto const& [script_pub_key, index] : m_map_script_pub_keys) {
        if (index >= minimum_index) script_pub_keys.insert(script_pub_key);
    }
    return script_pub_keys;
}
int32_t DescriptorScriptPubKeyMan::GetEndRange() const
{
    return m_max_cached_index + 1;
}
bool DescriptorScriptPubKeyMan::GetDescriptorString(std::string& out, const bool priv) const
{
    LOCK(cs_desc_man);
    FlatSigningProvider provider;
    provider.keys = GetKeys();
    if (priv) {
        
        
        
        return m_wallet_descriptor.descriptor->ToPrivateString(provider, out);
    }
    return m_wallet_descriptor.descriptor->ToNormalizedString(provider, out, &m_wallet_descriptor.cache);
}
void DescriptorScriptPubKeyMan::UpgradeDescriptorCache()