I discovered a weird effect where after adding a light object to a scene and setting it to be the global light, it caused a particle object to suddenly produce far fewer particles. Deleting the light object from the scene and the list of objects didn’t restore the particle object back to how it was before the light object was added.
This was a quite a complex scene, so I deleted all other objects except the particle object and an object it was set to “follow”. The attached file is this minimal scene. If you add a new light object with all the default settings and drop it anywhere on the scene you get a white disc as expected when you preview. If you now stop the preview and tick the “Set light as the global light” option, when you click preview again, GDevelop will freeze. Somehow the bug is even worse in this simple scene than when it was a complex scene.
Light+particle odd.gdg (16.1 KB)