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) {
```
const stdshared_ptr<CWallet> Instance(new CWallet(chain, name, args, stdmove(database)), ReleaseWallet);
    bool rescan_required = false;
    DBErrors nLoadWalletRet = Instance->LoadWallet();
    if (nLoadWalletRet != DBErrorsLOAD_OK) {
        if (nLoadWalletRet == DBErrorsCORRUPT) {
            error = strprintf(_("Error loading %s Wallet corrupted"), File);
            return nullptr;
        }
        else if (nLoadWalletRet == DBErrorsNONCRITICAL_ERROR)
        {
            warnings.push_back(strprintf(_("Error reading %s! All keys read correctly, but transaction data"
                                           " or address book entries might be missing or incorrect."),
                File));
        }
        else if (nLoadWalletRet == DBErrorsTOO_NEW) {
            error = strprintf(_("Error loading %s Wallet requires newer version of %s"), File, PACKAGE_NAME);
            return nullptr;
        }
        else if (nLoadWalletRet == DBErrorsEXTERNAL_SIGNER_SUPPORT_REQUIRED) {
            error = strprintf(_("Error loading %s External signer  being loaded without external signer support compiled"), File);
            return nullptr;
        }
        else if (nLoadWalletRet == DBErrorsNEED_REWRITE)
        {
            error = strprintf(_("Wallet needed to be rewritten restart %s to complete"), PACKAGE_NAME);
            return nullptr;
        } else if (nLoadWalletRet == DBErrorsNEED_RESCAN) {
            warnings.push_back(strprintf(_("Error reading %s! Transaction data may be missing or incorrect."
                                           " Rescanning ."), File));
            rescan_required = true;