A sphere appears out of nowhere when run

So, I have this blueprints project. In editor everything is fine, test run from viewport is also flawless. But after I package the game for Windows32 or test run it from the Blueprints editor, out of nowhere a small, untextured sphere appears at coordinates 0, 0, 0.

Here it is in the editor:


…and the runtime. Notice the sphere? While it looks like it’s in its place, it isn’t supposed to be there, at all. I didn’t even make any ball yet!


I have no idea what is going on, honestly. I’ve noticed somebody already had a similar problem with a “stray sphere”, but the solution mentioned there didn’t really work for me, I’m using an empty project, no additional blueprints except for the ones I made myself.

I have created a custom GameMode with the “DefaultSceneRoot” checked as hidden, but, nope, it’s still there.