Turbo Blow Off Valve Sound Gets Cut Occasionally

You can hear from the video, the blow off audio from the turbo gets cut off sometimes. Sounds very unnatural and I am unsure what is causing the inconsistency. If you are under boost and let go of the throttle, the full sound should play in its entirety.
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Also I know there are mods like RK's Turbo Everything mod which allows you to make a custom turbo where you can change parameters such as how quickly the turbo spools, but I would love for this to be a vanilla addition.

 

This is with all mods disabled, along with all cache deleted beforehand. It's not consistent enough to associate with a specific controller input, but I have tried doing exactly what is shown in the video in version 0.30.5 and a fresh install of 0.31.2 with the same results. This is done with an unmodified race spec 200bx.