Retrieving balance of Taproot address from Electrum Server

I’m having troubles retrieving the balance of taproot addresses from a self-hosted Electrs (Electrum Server).

First of all I’m getting the scriptPubKey from Bitcoin Core:

{
  "isvalid": true,
  "address": "...",
  "scriptPubKey": "...",
  "isscript": true,
  "iswitness": true,
  "witness_version": 1,
  "witness_program": "..."
}

Then I’m using this PHP code to query the balance from the Electrs server:

$addrScripthash = hash('sha256', hex2bin($address_info['scriptPubKey']));
$re="/.{2}/";
preg_match_all($re, $addrScripthash, $matches, PREG_PATTERN_ORDER, 0);
$addrScripthash = implode('', array_reverse($matches[0]));

$electrs->sendRequest('blockchain.scripthash.subscribe', array($addrScripthash))->result;

var_export($electrs->sendRequest('blockchain.scripthash.get_balance', array($addrScripthash))->result);

Unfortunately it seems to hang while it used to work just fine with Segwit addresses. Am I doing something wrong?