UE4: OSP Wwise plugin "Shared Reverb Attenuation Range" parameters not working

I'm testing the OSP Wwise plugin with UE4 but didn't notice any effect the "Shared Reverb Attenuation Range" parameters have on the output. I noticed the level of reverb increased as the player moved away from the sound source, until the distance exceeded the max value of "Attenuation Range Max" setting of the target sound source 

No matter whether enable "Oculus Attenuation" or not, the reverb never attenuates, only the direct(dry) sound getting affected. 

I'm using OSP version 32.0.0 and Wwise 2021.1.5.