Happened to me today.
I managed to recover the “deleted” Category but in it’s place I totally lost another category. Now every time I interact with the stash I’m scared…
Interesting with so many reports going back a month it is still around…
We’re still working on it, folks 
Some bugs are not easy fixes even if they appear to be. We’ll have an update very soon actually.
2 Likes
Should be fixed [in this patch (0.9h)] (Beta 0.9h Patch Notes - #3 by BlakLanner)
-edit-
Can confirm, fixed
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