### 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_KeyStore);
    if (m_storage.IsLocked()) return false;
    
    unsigned int nTargetSize;
    if (kpSize > 0) {
        nTargetSize = kpSize;
    } else {
        nTargetSize = m_keypool_size;
    }
    int64_t target = std::max((int64_t) nTargetSize, int64_t{1});
    
    
    int64_t missingExternal;
    int64_t missingInternal;
    if (chain == m_hd_chain) {
        missingExternal = std::max(target - (int64_t)setExternalKeyPool.size(), int64_t{0});