PlaybackLoudness property not shown in Sound Properties?

I am trying to test out playback loudness for Sounds and it seems like while it is defined as property through a script, it doesn’t seem to exist in the property tab of the Sound Object. Is this a bug or is it suppose to do this? I thought it would be some read only value but it doesn’t seem to show up at all when I click on the sound object.

I see it just fine.

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PlaybackLoudness is also supposed to only to be used by a script, so the Property won’t even update.

Yeah, I think I see it, I have no idea how I didn’t notice it.