Steps to reproduce the issue

On User > Fields, Content > Fields or any of the components using Joomla's com_fields template.

Expected result

Expected to sort by Field Group

Actual result

403 error

System information (as much as possible)

In file administrator/components/com_fields/tmpl/fields/defalt.php found the following:
<thead> <tr> <td class="w-1 text-center"> <?php echo HTMLHelper::_('grid.checkall'); ?> </td> <th scope="col" class="w-1 text-center d-none d-md-table-cell"> <?php echo HTMLHelper::_('searchtools.sort', '', 'a.ordering', $listDirn, $listOrder, null, 'asc', 'JGRID_HEADING_ORDERING', 'icon-sort'); ?> </th> <th scope="col" class="w-1 text-center"> <?php echo HTMLHelper::_('searchtools.sort', 'JSTATUS', 'a.state', $listDirn, $listOrder); ?> </th> <th scope="col"> <?php echo HTMLHelper::_('searchtools.sort', 'JGLOBAL_TITLE', 'a.title', $listDirn, $listOrder); ?> </th> <th scope="col"> <?php echo HTMLHelper::_('searchtools.sort', 'COM_FIELDS_FIELD_TYPE_LABEL', 'a.type', $listDirn, $listOrder); ?> </th> <th scope="col"> <?php echo HTMLHelper::_('searchtools.sort', 'COM_FIELDS_FIELD_GROUP_LABEL', 'g.title', $listDirn, $listOrder); ?> </th> <th scope="col" class="w-10 d-none d-md-table-cell"> <?php echo HTMLHelper::_('searchtools.sort', 'JGRID_HEADING_ACCESS', 'a.access', $listDirn, $listOrder); ?> </th> <?php if (Multilanguage::isEnabled()) : ?> <th scope="col" class="w-10 d-none d-md-table-cell"> <?php echo HTMLHelper::_('searchtools.sort', 'JGRID_HEADING_LANGUAGE', 'a.language', $listDirn, $listOrder); ?> </th> <?php endif; ?> <th scope="col" class="w-5 d-none d-md-table-cell"> <?php echo HTMLHelper::_('searchtools.sort', 'JGRID_HEADING_ID', 'a.id', $listDirn, $listOrder); ?> </th> </tr> </thead>

Additional comments

Notice the "g.title" . When changed to a.title, error clears.