I'm seeing a repeat of the brightness flickering when I use certain combinations of levels and color curves fx's (and possibly the lut fx) at the clip level on 10-bit TIFFs in a 32-bit video levels project. I originally reported these issues here:
https://www.vegascreativesoftware.info/us/forum/32-bit-video-renders-brightness-flickering--138356/
This was affecting GoPro HEVC 10-bit files, and seemed to go away in at least one of the prior builds. It's back, and now affecting 10-bit TIFFs in a project where there are no HEVC files