Cannot create file associations in new Plasma install

[dinominant]

I recently did a fresh install of Gentoo in order to migrate to Plasma and now I am unable to create new file associatations. The File Associations dialog in the System Settings acts as though it is working, but if I save then close it, the changes are lost. I've tried creating an empty ~/.local/share/applications/mimeapps.list but the file is never modified.

Do I have to install some extra compoinent that was removed in kde4?
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