Binary packaged Ocenaudio segfaults, need help

Hey,
I’m new to packaging on NixOS but I already managed to successfully package Ocenaudio audio editor on my NUR repository. Here is the build file https://git.project-insanity.org/onny/nur-packages/-/blob/master/pkgs/applications/audio/ocenaudio/default.nix
Unfortunately it is unable to start and segfaults. I captured the Valgrind debug output here https://git.project-insanity.org/snippets/64
What is the best way to debug this issue?

Best regards
Jonas