Binary packaged Ocenaudio segfaults, need help

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 Files · master · onny / nur-packages · GitLab
Unfortunately it is unable to start and segfaults. I captured the Valgrind debug output here ocenaudio segfault ($64) · Snippets · Snippets · GitLab
What is the best way to debug this issue?

Best regards