Attenuation Occlusion works in some cases and not others, is it a bug?

I have two Attenuation Data files, they both come from the “Spatial Audio Temple” project actually, and I set the Attenuation Occlusion settings identical to both, but one one file, the “SA_BirdTweetAttenuation” the occlusion works, while the other Attenuation file “SA_MusicAttenuation” when added to the same sound object, does not occlude the sound at all.

I have attached an image of the two files and their settings, what setting in these two files could account for this difference?

Hello,

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Thanks