When exporting a video from Topaz Video AI 4.1.1, one frame from the end of the video is lost. I took a video (1920x1080, 30 fps) with a duration of exactly three seconds and enhanced it to 3840x2160 60 fps. After the conversion, the video is one frame shorter. When added to the timeline, you can see the difference in the number of frames between the original video and the video processed by Topaz.
Windows 11, Intel(R) Core™ i7-10875H, 64GB RAM, Nvidia GeForce RTX 2060 Max-Q