segfaults on flatpak LMMS

[scarf005]

https://github.com/user-attachments/assets/edcf2088-90c9-4fe5-b2dd-d588e89d3f93

Reproduction

1. install flatpak LMMS v1.2.2
2. load a linux native VST (example uses https://socalabs.com/synths/piano/)
3. it crashes upon clicking piano.

flatpak run io.lmms.LMMS
Failed to create wl_display (No such file or directory)
qt.qpa.plugin: Could not load the Qt platform plugin "wayland" in "" even though it was found.
Qt: Session management error: Could not open network socket
Notice: could not set realtime priority.
[carla] Trying to start carla-plugin using "/app/share/carla/resources/carla-plugin"
LRDF Support not available (LADSPA-RDF will be disabled)
Carla 2.4.2 started, status:
  Python version: 3.12.9
  Qt version:     5.15.15
  PyQt version:   5.15.11
  Binary dir:     /app/lib/carla
  Resources dir:  /app/share/carla/resources
Failed to create wl_display (No such file or directory)
qt.qpa.plugin: Could not load the Qt platform plugin "wayland" in "" even though it was found.
Qt: Session management error: Could not open network socket
[carla] ALL OK!
Frontend pixel ratio is 1.0
scarf@fedora ~ [SIGSEGV]>