Hello Bo, this is Beda, I will handle this issue.
Let me first outline my findings and the correct workflow you should use:
1. The Template Layout used here is empty.
2. As soon you insert a Post Body cell, this problem to me seems solved.
3. It is however not solved if a Post Body cell (or call to it) is missing from the layout.
==> So you *need* either a Post body cell or [wpv-post-body view_template="None"] in a Visual Editor cell for example in a Layout to have the issue gone away.
This is of course not expected, but it would help you to solve the current problem easily.
I have another concern thou, which leads us to how to use Toolset with Page Builders:
1. This site is using a page Builder
2. When you use a page Builder you should not use Toolset Layouts and especially not if you use WP Bakery, this is very well explained on our DOC:
https://toolset.com/documentation/user-guides/using-toolset-with-wpbakery-page-builder/
>Toolset also features its own builder plugin called Layouts. However, when using Toolset with WPBakery Page Builder, we recommend not activating Layouts and using WPBakery Page Builder instead.
==> You will understand that since we do not expect the users to use Layouts in a not supported way, we also do not test it in this regard, and fixes would be not necessary as the plugin should not be activated in the first place.
There is one more problem - even if you would use Toolset Layouts (which is not supported for par builders) you would have to create Templates with Toolset, and edit them with the Builder, not the other way around.
This is visible in the process we suggest for Content Templates within Post Loops that can be edited with such builders.
But, the other way around is not suggested (Create a template with the Builder and use Content Templates within itself)
Clearly in this case, Layout should be fully removed from this site.
We do not support the usage of WP Bakery with Toolset Layouts (as somehow it's redundant to use both together)
I am in a difficult situation thou as you say this happened due to an update.
I would like to know if you have a backup from before that update.
Then we could check if we can do something, but as said, this will most likely not be regarded, as it is never supposed to be used in this constellation.
I hope my explanation on the issue is clear, please do not hesitate to feedback any matter you would like to share with me.
It would be interesting to have a copy of pre-update as well.
Thank you for your understanding and cooperation!