Searching in the set filter window (which should be renamed to "set logistic slot" or "assign logistic slot") any item name that has a space shows categories that are completely empty. This is reliable reproducable with a lot of names and seems to get worse with fuzzy search enabled but is not exclusive to it.
![Image](https://forums.factorio.com/images/ext/6929c8c87eeb636f7c9533b6f582a210.png)
more pics of it:
https://i.imgur.com/o7Z3afv.jpg
https://i.imgur.com/DnmGccw.jpg
https://i.imgur.com/QqDpUcU.jpg