[Not a bug] [2.1.9] Cannot manually set "Landing pad unloading bay" as a filter in inserters/splitters/storage chest

[SuperBananaBomb]

edit: Turns out It was because I didn't have the research for this item. With the research done, it shows up.


While adding unloading bays to my mall, i noticed that I was unable to set them as filters.

Repro steps:
1) Place inserter
2) Check "Use filters" box
3) Attempt to set "Landing pad unloading bay"

Same issue with splitters and storage chest.
Interestingly, if I use "Set Filters" with a constant combinator to set the filter, then I am still able to specify the filter.
Also, if I drag & drop an actual item in the filter, then the filter is also set just fine.

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