Tidal Brickwall

I was using the fabfilter AU and noticed that when playing Tidal tracks the seems to be a brickwall filter showing in the Fabfilter fft graph between 17khz and 26khz. I.e. no sound.

I know this is outside of hearing range but just wonder if anyone can confirm.

Apologies if a) you consider this as tidal issue and not Audirvana. Tidal support has not responded. B) this is not for the AU blog.