Created attachment 144050 [details] Video of the bug SUMMARY *** Using the Obscure effect on a track makes the tracks below it not visible. *** STEPS TO REPRODUCE 1. Create 2 tracks with videos on both of them 2. Place obscure-effect on the track above 3. Play the video and the bottom layer does not play OBSERVED RESULT Part of the tracks don't play EXPECTED RESULT Tracks below work correctly SOFTWARE/OS VERSIONS Kdenlive: Kdenlive_Nightly_Appimage_Build #1102 Linux/KDE Plasma: 5.10.79-1-MANJARO KDE Plasma Version: 5.23.3 KDE Frameworks Version: 5.88.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION View video.