I did a little workaround that solved it for me. Using a avisynth script and a program that generated the scripts in batches. I had it duplicate the last frame of all the videos. And doing so made it process all the frames. Tho that did end up producing one frame too many. But that was easily solved by then running another batch script to trim away that extra frame. Bit tedious but I now ended up with the correct exact total time for the video.
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