Unable to create group tracks in specific project

A project I’ve been working on is suddenly not allowing me to create group tracks, or duplicate folders. I already have many group tracks in this project, but now the option is permanently greyed out:

I’ve been working on the project today, and have been creating other group tracks. Is there some kind of keyboard shortcut I’ve that disables the ability to create group tracks?!

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I’m also not able to duplicate folders anymore, apart from one single folder that it still works with:

For all my other folders, the option to duplicate it simply isn’t there, but it is on this one:

Hi, what version of Cubase are you using, there are different amounts of group tracks allowed dependent on your version.

The Overview section here shows how many Tracks & Channels different editions of Cubase support.