Nemo not default nor can be set as default

I realized today my install of Cinnamon does not have a default file manager.
Nemo is installed, and works, but it is not default nor can it be set as default, it is not available in the list. (See screenshot).

Screenshot from 2020-05-15 17-17-38

Edit: I still don’t know WHY, but in the terminal it worked with:

xdg-mime default nemo.desktop inode/directory application/x-gnome-saved-search

Of course this should not be neccesary, and Nemo still doesn’t show up in the list of possible choices. But it is set, and I won’t remove it, so… all good I… guess?

I still want to know what causes this bug but at least it works.

I just installed Cinnamon again just for something to do. Nemo is installed and working as preferred app. So what else did you install? Terminal? and ?? Maybe something you added?

Screenshot from 2020-05-15 12-22-01

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I think I figured out… not the EXACT cause but the suspect:

I didn’t do a reinstall, I just purged Xfce completely and installed Cinnamon.
HOWEVER: I had already set Nemo as default file manager in Xfce, as I usually do (I REALLY don’t like Thunar).

I wonder if by purging Xfce with Nemo already installed and set as default somehow got a dot file somewhere to indicate that Nemo doesn’t exist? Even after reinstalling it?

Do you have all these installed?

Screenshot from 2020-05-15 12-33-00

Screenshot from 2020-05-15 12-33-10

Maybe check in ~./config for thunar?
Edit: You may be right if you removed Xfce that way?