So below you will see the original footage and the one rendered out of Vegas with no changes done to it. I have already done my fair bit of research and ran upon this thread
but my issue is not with the preview, but with Vegas straight-up darkening the video after I render. I exported the same video from After Effects and there was no darkening problem. So I assume the issue is Vegas-related. I tried different codecs too and the issue still remained in Vegas.