FLStudio 12.3 and upward it makes FLStudio crash immediately.
Said plugin when loaded as part of a song and if it is not set to be visible (to view the GUI of the plugin), it does not crash ...
FL Browser or the '+'-sign in the Channel Rack.
On the other hand, when the synth is loaded from the 'Plugin Database --> Installed --> Generators' section of the FL Browser, it always loads fine.
Re-scanning my plugins in 'Options ...