Can't create a new folder.

I was experimenting with creating different folders and now I can't make a new one in a specific destination.

This is what I did.

I created a new folder.
I didn't rename it.
I right-clicked and set sharing to 'Nobody'.

The folder then disappeared and now when I try to make a new folder, it won't let me.

When I use the search tool, I can see the folder but it won't let me delete it.

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