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It seems like it was indeed meant to be added to hvac_library.osm but was forgotten.

I opened an issue on Github: Issue#3130 and I just fixed it in PR#3131. It should get merged in soon and be available in the next OpenStudio version or shortly thereafter.

If you want a quick fix, you can head over to your local copy of hvac_library.osm (on Windows that's something like C:\openstudio-x.y.z\Resources\default\hvac_library.osm), open it up, and paste the following snippet:

OS:SetpointManager:SingleZone:Humidity:Minimum, 
  {3beb4328-e84f-4368-9105-1071d292ebe3}, !- Handle 
  Setpoint Manager Single Zone Humidity Minimum, !- Name 
  MinimumHumidityRatio,                   !- Control Variable 
  ,                                       !- Setpoint Node or NodeList Name 
  ;                                       !- Control Zone Name

I doubt you'd have a handle conflict, but to make sure do a search for {3beb4328-e84f-4368-9105-1071d292ebe3} in the entire file, you should find only one occurrence: the one you added.

Then relaunching the OS App, you should now be able to drag and drop this SetpointManager.