Two objects are flickering/An object disappeared

If two objects are flickering, some z-fighting must be happening: If the objects have the same z order value, GDevelop cannot decide which one must be drawn first, so that some times one of the object is drawn first, and some times it is the other objects.
You can prevent this issue from happening by changing the z Order of your objects in the Scene editor.

If an object seems to have disappeared, check that it is not hidden by a large image such as a background.