Steps to reproduce the issue

In the admin side edit of a record, using the Tabs to display various fieldsets for your component, fails to add a tab containing the custom fields within a group set within 3rd party component.
Need a 3rd party component designed for J4 with Custom Fields set up. Add a new custom field within a custom field group.

Expected result

A new tab displaying the custom fields within the group if any exist just like com_users.

Actual result

Custom field displays at the bottom of each existing tab with notices:
Notice: Undefined index: Joomla\CMS\HTML\Helpers\Bootstrap::startTabSet in mydomain\libraries\src\HTML\Helpers\Bootstrap.php on line 860
Notice: Trying to access array offset on value of type null in mydomain\libraries\src\HTML\Helpers\Bootstrap.php on line 860
Notice: Trying to access array offset on value of type null in mydomain\libraries\src\HTML\Helpers\Bootstrap.php on line 860

System information (as much as possible)

J4.0.4
PHP 7.4.9
MySql 8.0.21
Apache 2.4.46
Windows 10 using WAMP 3.2.3

Additional comments

This may be related to #33409 which has been closed due to no "interest". Sorry just trying to learn how to incorporate Custom Fields into one of my components.

Code used in the admin side edit of a single record (edit.php):

echo HTMLHelper::_('uitab.startTabSet', 'myTab', array('active' => 'general'));

echo HTMLHelper::('uitab.addTab', 'myTab', 'general', Text::('COM_MYCOMP_TITLE', true));

echo $this->form->renderFieldset('general');

echo HTMLHelper::_('uitab.endTab');

$this->ignore_fieldsets = array('general');
echo LayoutHelper::render('joomla.edit.params', $this);

echo HTMLHelper::_('uitab.endTabSet');