### 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_
CPubKey a, b;
        SigningProvider dummy;
        KeyOriginInfo dummy_info;
        GetPubKey(0, dummy, a, dummy_info);
        other.GetPubKey(0, dummy, b, dummy_info);
        return a < b;
    }
    /** Derive a public key.
     *  read_cache is the cache to read keys from (if not nullptr)
     *  write_cache is the cache to write keys to (if not nullptr)
     *  Caches are not exclusive but this is not tested. Currently we use them exclusively
     */
    virtual bool GetPubKey(int pos, const SigningProvider& arg, CPubKey& key, KeyOriginInfo& info, const DescriptorCache* read_cache = nullptr, DescriptorCache* write_cache = nullptr) const = 0;
    
    virtual bool IsRange() const = 0;
    
    virtual size_t GetSize() const = 0;
    
    virtual std::string ToString() const = 0;
    
    virtual bool ToPrivateString(const SigningProvider& arg, std::string& out) const = 0;
    /** Get the descriptor string form with the xpub at the last hardened derivation,
     *  and always use h for hardened derivation.
     */
    virtual bool ToNormalizedString(const SigningProvider& arg, std::string& out, const DescriptorCache* cache = nullptr) const = 0;
    
    virtual bool GetPrivKey(int pos, const SigningProvider& arg, CKey& key) const = 0;
};
class OriginPubkeyProvider final : public PubkeyProvider