Timelapse is inverted (upside down)

As per title, my timelapses are upside down. The photos are right side up, but the resulting render is always flipped. I have tried the flip_y: TRUE in moonraker.conf followed by a save and restart and even a complete host restart, then triggering another manual TIMELAPSE_RENDER. Yet, to no avail, as the result is always a flipped video. Suggestions?