Segfault in Kdenlive when adding crossfade on audio channel.
Hi there!
Kdenlive crashes quite reliably with the kdenlive project below, when adding in crossfades on the audio.
[Crash_Test.kdenlive](/uploads/90e08276ed07be6cd23db3dea7330a29/Crash_Test.kdenlive)
Here is the GDB backtrace:
[2023-08-30_Kdenlive-Crash.txt](/uploads/902a3661028b2aa77d9f7254e8655ae4/2023-08-30_Kdenlive-Crash.txt)
And lastly, a video of how to induce the crash:

issue