Well, on my side, the only thing to do to reproduce is set codec to AAC and channel to mono. I've tried all i could think of, bitrate, format, save to file, actual streaming, 32bit and 64bit versions, recording desktop, microphone, both, with any audio related option enabled or disabled, bug is always there.
Also, keeping all settings exactly the same and simply change AAC to MP3 makes it go away.