### 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_
bool internal = false;
            uint32_t index = 0;
            if (keyMeta.hdKeypath != "s" && keyMeta.hdKeypath != "m") {
                std::vector<uint32_t> path;
                if (keyMeta.has_key_origin) {
                    
                    path = keyMeta.key_origin.path;
                } else {
                    
                    if (!ParseHDKeypath(keyMeta.hdKeypath, path)) {
                        strErr = "Error reading wallet database: keymeta with invalid HD keypath";
                        return DBErrors::NONCRITICAL_ERROR;
                    }
                }
                
                
                
                
                if (path.size() != 3) {
                    strErr = "Error reading wallet database: keymeta found with unexpected path";
                    return DBErrors::NONCRITICAL_ERROR;
                }
                if (path[0] != 0x80000000) {
                    strErr = strprintf("Unexpected path index of 0x%08x (expected 0x80000000) for the element at index 0", path[0]);
                    return DBErrors::NONCRITICAL_ERROR;
                }
                if (path[1] != 0x80000000 && path[1] != (1 | 0x80000000)) {
                    strErr = strprintf("Unexpected path index of 0x%08x (expected 0x80000000 or 0x80000001) for the element at index 1", path[1]);
                    return DBErrors::NONCRITICAL_ERROR;