I have noticed something odd when it comes to rendering (at least on VEGAS Pro 21, I haven't tested on other NLE). It turns out that occasionally the last second of my render will result in random bits of audio.
In the ending of this render, I faded out the audio. So I should expect the audio to fade out and be silent at the end. But when rendering with VoPro this happens. It's a completely random segment of audio from the render for around 1 entire second.
Something to note is that this will only happen when the entire project is rendered (This particular project was around 3 minutes). When only rendering the end of the project, this audio bug will not occur. I wasn't able to determine at what point the audio bug will happen (ie: if I rendered 1/2 of the project, 3/4ths of the project, or 5/8ths of the project), but It will 100% happen when the entire project is rendered at once.
This has happened to me with a few other projects before, But i just worked around it by leaving an extra second to render. I'd prefer not to do this though. The other projects I've worked with have different source footage, etc. So I don't think it's anything to do with that
Here is my scene file, if it is needed:
VoPro Scene File.zip
Also I can send the rendered out project with the audio bug and project file + source footage if anything else is needed.