Hello Drupal Community,
Since the last update of the Drupal modules and themes, there is an issue with the Landing Pages module and more specifically with the Edit Form of the nodes.
More specifically the issue is caused due to the fact that the module that enables the grouping of the fields produces an error with the latest version of Drupal Core. As a result the Manage Form Display is not properly saved and the fields in the form are not encapsulated correctly.
Important Note: The issue is related to the edit form of the Landing Page, not to the appearance/rendering of the components.
The issue does not affect the appearance of the Landing Page, only the Edit Form.
We are sorry in advance for the inconvenience, we will try to resolve the issue as soon as possible.
Update 05/08/2019
The issue is now resolved thanks to a patch in the paragraphs module.
Regards,
Kostas