Export to multiple resolutions at once with Voukoder crashes Adobe Media Encoder

I just tried to do a multi-resolution export in AME, as was shown in this video tutorial: https://youtu.be/Er7LcrtyCBo

It worked with built into AME H.264 CPU encoder just fine. But, when I tried Voukoder (both H.264 NVENC and a regular H.264), AME was crashing every time I started my render queue. Am I doing something wrong, or is there some kind of limitation in Voukoder / FFmpeg that prevents multiple videos from being encoded at the same time?

Would it be possible to add such functionality in future releases?