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Can you repeat the problem? If so, what are the steps?
(Please be specific and use the names as seen in Shotcut, preferably English. Include a screenshot or screen recording if you can. Also, you can attach logs from either View > Application Log or right-click a job and choose View Log.)
I have a png that I fade in and out using the Fade-video In and Fade-Video out. All works as normal unless I then change the length of the clip. I then get a rogue single frame of unfaded picture at the end of the fade-video out