Since the update from Joomla 4.4.3 to Joomla 5.1.4, the AJAX availability validation field has stopped working correctly.
It no longer displays any alerts, whether the item is available (PLG_CCK_FIELD_VALIDATION_AJAX_AVAILABILITY_ALERT2) or not (PLG_CCK_FIELD_VALIDATION_AJAX_AVAILABILITY_ALERT1) or while validating (PLG_CCK_FIELD_VALIDATION_AJAX_AVAILABILITY_ALERT3).
The following JavaScript error appears in the browser console:
Uncaught TypeError: JCck.Core.trigger is not a function
Any help or fix will be appreciated
Best regards