### 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_
sigdata.sha256_preimages = preimages;
                    sigdata.hash256_preimages = preimages;
                    sigdata.ripemd160_preimages = preimages;
                    sigdata.hash160_preimages = preimages;
                    const auto prod_sig_res = ProduceSignature(FlatSigningProvider{keys_priv}.Merge(FlatSigningProvider{script_provider}), creator, spks[n], sigdata);
                    BOOST_CHECK_MESSAGE(prod_sig_res == !(flags & SIGNABLE_FAILS), prv);
                }
                
                auto inferred = InferDescriptor(spks[n], script_provider);
                BOOST_CHECK_EQUAL(inferred->IsSolvable(), !(flags & UNSOLVABLE));
                std::vector<CScript> spks_inferred;
                FlatSigningProvider provider_inferred;
                BOOST_CHECK(inferred->Expand(0, provider_inferred, spks_inferred, provider_inferred));
                BOOST_CHECK_EQUAL(spks_inferred.size(), 1U);
                BOOST_CHECK(spks_inferred[0] == spks[n]);
                BOOST_CHECK_EQUAL(InferDescriptor(spks_inferred[0], provider_inferred)->IsSolvable(), !(flags & UNSOLVABLE));
                BOOST_CHECK(GetKeyOriginData(provider_inferred, flags) == GetKeyOriginData(script_provider, flags));
            }
            
            
            for (const auto& origin : script_provider.origins) {
                BOOST_CHECK_MESSAGE(paths.count(origin.second.second.path), "Unexpected key path: " + prv);
                left_paths.erase(origin.second.second.path);
            }
        }
    }
    
    BOOST_CHECK_MESSAGE(left_paths.empty(), "Not all expected key paths found: " + prv);
}
void Check(const std::string& prv, const std::string& pub, const std::string& norm_pub, int flags,