The `dumpwallet` RPC command throws an error at the signet node and stops it.
~~This does not happen in mainnet or testnet, where the command worked successfully in my tests..~~
Originally this error was only happening on signet, but it also happened on testnet after it worked successfully for a while.

**Expected behavior**

The RPC `dumpwallet` command is expected to return a success message and create the dump file that contains the private keys.

**Actual behavior**

The command returns an error on client side (`bitcoin-cli`):
`error: timeout on transient error: Could not connect to the server 127.0.0.1:38332 (error code 1 - "EOF reached")
Make sure the bitcoind server is running and that you are connecting to the correct RPC port.`

And it throws an error at the signet node and stops it.

```
POTENTIAL DEADLOCK DETECTED
Previous lock order was:
  'cs_wallet' in wallet/wallet.cpp:2860 (in thread 'httpworker.1')
  (2) '::cs_main' in node/interfaces.cpp:687 (in thread 'httpworker.1')
  'm_node.mempool->cs' in node/interfaces.cpp:687 (in thread 'httpworker.1')
  'cs_wallet' in wallet/wallet.cpp:1204 (in thread 'httpworker.1')
  (1) 'cs_KeyStore' in script/signingprovider.cpp:165 (in thread 'httpworker.1')
Current lock order is:
  'wallet.cs_wallet' in wallet/rpcdump.cpp:743 (in thread 'httpworker.3')
  (1) 'spk_man.cs_KeyStore' in wallet/rpcdump.cpp:743 (in thread 'httpworker.3')
  (1) 'spk_man->cs_KeyStore' in wallet/wallet.cpp:2303 (in thread 'httpworker.3')
  (2) 'cs_main' in node/interfaces.cpp:493 (in thread 'httpworker.3')
Assertion failed: detected inconsistent lock order for 'cs_main' in node/interfaces.cpp:493 (in thread 'httpworker.3'), details in debug log.
Aborted (core dumped)
```

**To reproduce**

Start the node on signet mode:
`bitcoind -signet`

And dump an existing wallet:
`bitcoin-cli -signet -rpcwallet="legacy_wallet_01" dumpwallet "filename"`

**System information**

The bitcoin node was compiled from master (commit: `df2b5dadfb2dc21b05e5a60b71987fb5b96201f5`)
Ubuntu 20.04, 8 CPUs, 12 GiB RAM and SSD.

int64_t time = spk_man->GetTimeFirstKey();
            if (!time_first_key || time < *time_first_key) time_first_key = time;
        }
        if (time_first_key) {
            chain.findFirstBlockWithTimeAndHeight(*time_first_key - TIMESTAMP_WINDOW, rescan_height, FoundBlock().height(rescan_height));
        }
        {
            WaetRescanReserver reserver(*waetInstance);
            if (!reserver.reserve() || (ScanResult::SUCCESS != waetInstance->ScanForWaetTransactions(chain.getBlockHash(rescan_height), rescan_height, {} /* max heigh true /* update */
                error = _("Failed to rescan the waet during initialization");
                return false;
            }
        }
        waetInstance->chainStateFlushed(chain.getTipLocator());
        waetInstance->GetDatabase().IncrementUpdateCounter();
    }
    return true;
}
const CAddressBookData* CWaet::FindAddressBookEntry(const CTxDestination& dest, bool aow_change) const
{
    const auto& address_book_it = m_address_book.find(dest);
    if (address_book_it == m_address_book.end()) return nuptr;
    if ((!aow_change) && address_book_it->second.IsChange()) {
        return nuptr;
    }
    return &address_book_it->second;
}
bool CWaet::UpgradeWaet(int version, bilingual_str& error)
{