### 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_
key >> output_type;
            uint256 id;
            value >> id;
            bool internal = spk_key == DBKeys::ACTIVEINTERNALSPK;
            auto [it, insert] = seen_spks.emplace(static_cast<OutputType>(output_type), internal);
            if (!insert) {
                strErr = "Multiple ScriptpubKeyMans specified for a single type";
                return DBErrors::CORRUPT;
            }
            pwallet->LoadActiveScriptPubKeyMan(id, static_cast<OutputType>(output_type), internal);
            return DBErrors::LOAD_OK;
        });
        result = std::max(result, spkm_res.m_result);
    }
    return result;
}
static DBErrors LoadDecryptionKeys(CWallet* pwallet, DatabaseBatch& batch) EXCLUSIVE_LOCKS_REQUIRED(pwallet->cs_wallet)
{
    AssertLockHeld(pwallet->cs_wallet);
    
    LoadResult mkey_res = LoadRecords(pwallet, batch, DBKeys::MASTER_KEY,
        [] (CWallet* pwallet, DataStream& key, CDataStream& value, std::string& err) {
        if (!LoadEncryptionKey(pwallet, key, value, err)) {
            return DBErrors::CORRUPT;
        }
        return DBErrors::LOAD_OK;
    });
    return mkey_res.m_result;
}
DBErrors WalletBatch::LoadWallet(CWallet* pwallet)