MP4 using HEVC will only record one audio track

[Mortus]

Version: 3.9.1
File Format: MP4
Hardware Acceleration: Nvidia NVENC HEVC

I have both a primary and secondary sound device set up, but it will not record the secondary device. I have tested with hardware acceleration disabled and using Nvidia NVENC and they both record both audio devices. The only workaround I can find is to record the secondary audio device as a separate audio file. Is this just a product of the HEVC or is there something else going on in my settings?

[Piotr]

Have you tried playing this video or does the issue occur in video editor?

[Mortus]

Sorry, I completely forgot I had posted this. When I open it in VLC, I have to swap between the two tracks to get either the game or the microphone. I use Vegas Pro 15 for my video editing, and it only loads one track.

[Piotr]

It is the issue with Vegas Studio, but try the steps below.
Go to Vegas Studio's location and open FileIO Plug-Ins folder.
Rename the compoundplug folder to something else.
See if that helps.

[Mortus]

Sadly that didn't work. I tried renaming and also removing the folder. I guess I'll have to use non-HEVC if I want to do hardware acceleration.