### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current behaviour

I randomly encountered this by loading a wallet created from master with an older version. I could trace it down to bd13dc2f46ea10302a928fcf0f53b7aed77ad260 (#26076), but I don't know descriptor wallets enough to understand what's going on (cc @Sjors @achow101).

### Expected behaviour

`bitcoind` starts, or at least tells me to use a later version if #26076 was a breaking change instead of corrupting `wallet.dat`.

### Steps to reproduce

(master, clean chain): 
`createwallet -regtest ""`
(v25.0rc2):
first `bitcoind -regtest` succeeds
then stop and restart the node: The second `bitcoind -regtest` leads to an InitError:
`Error: Error: Unable to expand wallet descriptor from cache`
now, the wallet cannot be loaded by either version.

### Relevant log output

_No response_

### How did you obtain Bitcoin Core

Compiled from source

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

v25.0rc2 / master

### Operating system and version

Ubuntu

### Machine specifications

_No response_
{
        CExtKey extkey;
        CExtKey dummy;
        if (!GetDerivedExtKey(arg, extkey, dummy)) return false;
        if (m_derive == DeriveType::UNHARDENED && !extkey.Derive(extkey, pos)) return false;
        if (m_derive == DeriveType::HARDENED && !extkey.Derive(extkey, pos | 0x80000000UL)) return false;
        key = extkey.key;
        return true;
    }
};
class DescriptorImpl : public Descriptor
{
protected:
    
    const std::vector<std::unique_ptr<PubkeyProvider>> m_pubkey_args;
    
    const std::string m_name;
    
    
    
    
    const std::vector<std::unique_ptr<DescriptorImpl>> m_subdescriptor_args;
    
    virtual std::string ToStringExtra() const { return ""; }