Created attachment 150499 [details] This images show the black background if we reduce the size of one of clips, if we use the "Screen" composition in the same timeline. SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** STEPS TO REPRODUCE 1. 2. 3. OBSERVED RESULT Transform effect and Screen composition don't work well with each other, because if we reduce one of the clips by the "Transform" effect and use the "Screen" composition, part of the second clip will be black in the same timeline. There are an attachemnt show that. EXPECTED RESULT SOFTWARE/OS VERSIONS Windows: 10 21H1 64bit macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION