Attempting to load a wallet with an unknown descriptor causes a fatal error:

```
2022-09-06T01:51:06Z init message: Loading wallet…
2022-09-06T01:51:06Z [descriptor] Invalid descriptor: Can only have tr at top level: iostream error
2022-09-06T01:51:06Z [descriptor] Invalid descriptor: Can only have tr at top level: iostream error
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 50e6032b4d1d62c020ebb6a4d0c8fafc6f01ea80f4d2a41c1a256086611636e9, type = legacy, internal = false
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 7f709abbde61e8c253798375692bf41202e625ed74a65f9474d464be34fb2870, type = p2sh-segwit, internal = false
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 2dc6c34099e0ca1235fc990a51042967ecbc8c8ac57062f964739cba2f451be8, type = bech32, internal = false
2022-09-06T01:51:06Z [descriptor] Setting spkMan to active: id = 8d3c63ea1ac9936e789713dc8bae857d328ff029ab9392e67c716752e9b11b0c, type = bech32m, internal = false
2022-09-06T01:51:06Z [descriptor] Releasing wallet
2022-09-06T01:51:06Z 

************************
EXCEPTION: St12out_of_range       
map::at       
bitcoin in Runaway exception       



************************
EXCEPTION: St12out_of_range       
map::at       
bitcoin in Runaway exception       

bitcoin-qt: ./checkqueue.h:204: CCheckQueue<CScriptCheck>::~CCheckQueue() [T = CScriptCheck]: Assertion `m_worker_threads.empty()' failed.
Aborted
```

> A fatal error occurred. Bitcoin Core can no longer continue safely and will quit.

To reproduce, a quick hack:

```c++
--- a/src/script/descriptor.cpp
+++ b/src/script/descriptor.cpp
@@ -1408,7 +1408,7 @@ std::unique_ptr<DescriptorImpl> ParseScript(uint32_t& key_exp_index, Span<const
         error = "Can only have addr() at top level";
         return nullptr;
     }
-    if (ctx == ParseScriptContext::TOP && Func("tr", expr)) {
+    if (ctx == ParseScriptContext::TOP && Func("trx", expr)) {
         auto arg = Expr(expr);
         auto internal_key = ParsePubkey(key_exp_index, arg, ParseScriptContext::P2TR, out, error);
         if (!internal_key) {
```
CWalletTx& wtx = it->second;
        int currentconfirm = GetTxDepthInMainChain(wtx);
        // I
        assert(currentconfirm <= 0);
        // i
        if (currentconfirm == 0 && !wtx.isAbandoned()) {
            // I
            assert(!wtx.InMempool());
            wtx.m_state = TxStateInactive{/*ab};
            wtx.MarkDirty();
            batch.WriteTx(wtx);
            NotifyTransactionChanged(wtx.GetHash(), CT_UPDATED);
            // I
            for (unsigned int i = 0; i < wtx.tx->vout.size(); ++i) {
                stdpair<TxSpendsconst_iterator, TxSpendsconst_iterator> range = mapTxSpends.equal_range(COutPoint(now, i));
                for (TxSpendsconst_iterator iter = range.first; iter != range.second; ++iter) {
                    if (!done.count(iter->second)) {
                        todo.insert(iter->second);
                    }
                }
            }
            // I
            // a
            MarkInputsDirty(wtx.tx);
        }
    }
    return true;
}
void CWalletMarkConflicted(const uint256& hashBlock, int conflicting_height, const uint256& hashTx)
{