Arnauld Hey there - a few things I'll need to have you try, as this seems to be a paid app and I can't test it on my end.
Settings > Apps > Lumafusion > Enable Exploit Protection Compatibility Mode if it is available for that app
If it works after doing that (you might want to force stop the app before trying for good measure), then this app likely has a memory corruption bug that's being caught by hardened_malloc. The toggle mentioned above makes that specific app not use hardened_malloc so that it can work if it's buggy/problematic.
Another thing we can try if that doesn't work, though it's a long shot:
Settings > Security > Disable Secure App Spawning > Reboot the device and try launching the app again.
If it works, let us know, if it doesn't, let us know and we can look further into it!