### 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_
{
        assert(keys.size() == 1);
        XOnlyPubKey xpk(keys[0]);
        if (!xpk.IsFullyValid()) return {};
        WitnessV1Taproot output{xpk};
        return Vector(GetScriptForDestination(output));
    }
public:
    RawTRDescriptor(std::unique_ptr<PubkeyProvider> output_key) : DescriptorImpl(Vector(std::move(output_key)), "rawtr") {}
    std::optional<OutputType> GetOutputType() const override { return OutputType::BECH32M; }
    bool IsSingleType() const final { return true; }
};
enum class ParseScriptContext {
    TOP,     
    P2SH,    
    P2WPKH,  
    P2WSH,   
    P2TR,    
};
/**
 * Parse a key path, being passed a split list of elements (the first element is ignored).
 *
 * @param[in] split BIP32 path string, using either ' or h for hardened derivation
 * @param[out] out the key path
 * @param[out] apostrophe only updated if hardened derivation is found
 * @param[out] error parsing error message
 * @returns false if parsing failed
 **/
[[nodiscard]] bool ParseKeyPath(const std::vector<Span<const char>>& split, KeyPath& out, bool& apostrophe, std::string& error)