// Hook to override colpos check for unused tt_content elements
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/layout/class.tx_cms_layout.php']['record_is_used'][] = \MASK\Mask\Hooks\PageLayoutViewHook::class . '->contentIsUsed';
This should be added to the exported extension as well.
Mask has solved this issue with this hook: https://github.com/Gernott/mask/blob/master/Classes/Hooks/PageLayoutViewHook.php
// Hook to override colpos check for unused tt_content elements $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/layout/class.tx_cms_layout.php']['record_is_used'][] = \MASK\Mask\Hooks\PageLayoutViewHook::class . '->contentIsUsed';
This should be added to the exported extension as well.