### 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_
}
                
                std::set<CPubKey> pubkeys;
                for (const auto& xpub_map_pair : der_xpub_cache) {
                    for (const auto& xpub_pair : xpub_map_pair.second) {
                        const CExtPubKey& xpub = xpub_pair.second;
                        pubkeys.insert(xpub.pubkey);
                    }
                }
                
                for (const auto& xpub_pair : parent_xpub_cache) {
                    const CExtPubKey& xpub = xpub_pair.second;
                    pubkeys.insert(xpub.pubkey);
                    CExtPubKey der;
                    BOOST_CHECK(xpub.Derive(der, i));
                    pubkeys.insert(der.pubkey);
                }
                int count_pks = 0;
                for (const auto& origin_pair : script_provider_cached.origins) {
                    const CPubKey& pk = origin_pair.second.first;
                    count_pks += pubkeys.count(pk);
                }
                if (flags & MIXED_PUBKEYS) {
                    BOOST_CHECK_EQUAL(num_xpubs, count_pks);
                } else {
                    BOOST_CHECK_EQUAL(script_provider_cached.origins.size(), count_pks);
                }
            } else if (!(flags & MIXED_PUBKEYS)) {
                
                BOOST_CHECK(der_xpub_cache.empty());