@Wiew That picture you are pointing to is from the SEMW extensions that you need not for rendering a file. Probably that extension could not follow the pace of the Vegas Program itself due to? Without a problem you can undo that option this way
Ok... I rendered the same file but with AMD and saw 99.2%, but it did list the correct amount of frames, 05:07. Placed the rendered clip below the original and extended the timeline to see if the rendered clip was longer or shorted than the original, and they were both the same in length and frame count.