After the upgrade to 5.50.4, the extension details do not display for any of the extensions under Administer -> System Settings -> Extensions. Here is the HTML that is produced:
<tr class="hiddenElement even" id="crm-extensions-details-authx" role="row" style="display: table-row;">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>