So I encountered some strange issues with the vMix Zoom Plugin.

Here is a link to a recording to showcase the issues:

On the left is the feed from vMix Zoom Plugin.
On the right is via External Output > Virtual Camera > Official Zoom App. Audio is routed via VB Cable.
Both vMix Zoom Input and Official Zoom App is taking audio from the same Bus(BusA in this instance)

So the first thing I noticed is the black levels is wrong, it looks like it could be a dynamic range issue (The 0-255 / 16-235, Full Range vs Limited Range)
2nd issue is, there's some weird glitch with the vMix Zoom Plugin audio when playing back a tone pulse.
Audio is perfectly fine on vMix Recordings and Program Outputs, it only glitches out on zoom.
In the video, from 0-20 seconds is the vMix Zoom Plugin audio, 20-40 seconds is the audio from Official Zoom App, 43 seconds is switched back to the vMix Zoom Plugin audio.

I have tried both versions of the zoom plugin: Zoom 6.0.11 and Zoom 6.7.5

Running on latest vMix version: vMix 29 (29.0.0.46)