### 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_
{
    LOCK(cs_desc_man);
    return m_wallet_descriptor.descriptor->IsRange();
}
bool DescriptorScriptPubKeyMan::CanGetAddresses(bool internal) const
{
    
    
    LOCK(cs_desc_man);
    return m_wallet_descriptor.descriptor->IsSingleType() &&
           m_wallet_descriptor.descriptor->IsRange() &&
           (HavePrivateKeys() || m_wallet_descriptor.next_index < m_wallet_descriptor.range_end);
}
bool DescriptorScriptPubKeyMan::HavePrivateKeys() const
{
    LOCK(cs_desc_man);
    return m_map_keys.size() > 0 || m_map_crypted_keys.size() > 0;
}
std::optional<int64_t> DescriptorScriptPubKeyMan::GetOldestKeyPoolTime() const
{
    
    return std::nullopt;
}
unsigned int DescriptorScriptPubKeyMan::GetKeyPoolSize() const
{
    LOCK(cs_desc_man);
    return m_wallet_descriptor.range_end - m_wallet_descriptor.next_index;
}
int64_t DescriptorScriptPubKeyMan::GetTimeFirstKey() const