Missing panel layouts in UM 18.04

This is more out of curiosity because I don't really need them, but all of the default panel layouts except one are missing on my pc. My customized panel layouts are all there but from the default ones I have only gnome 2:

The previous time I checked they were all there but not today. It was a clean 18.04 install.
What could have happened?

I have the same situation pemartins. Please see -

This discussion from 2017 may have some bearing on our problem, although I don't quite get just why...

I did fresh reinstalls on two laptops and only one, at this time, still has access to more than GNOME2. Does it have something to do with editing the menus with mozo?

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I did edit a menu recently, I unchecked the category “Education” so it wouldn’t show up. Could this be the root of the disappearing?

I’m still trying to figure this out. Like you, I don’t think that this feature will be useful as far as I’m concerned however I am curious as to why it has happened.