It only happens sometimes, but it's really obnoxious.
Actually, it goes off stage, but you can't get it. If you click on the sprite, a blue ring flashes around it.

By duplicating, you mean clone?

I don't know if the ‘if on edge, bounce’ Motion block would help with this?

No, I should of specified. I mean when you duplicate a sprite by doing: left click -> duplicate sprite

I think this problem was created because when duplicating (left click on sprite -> duplicate) the new sprite goes to a random location. The programmers forgot to make sure it was in the stage.

Legodude2020 wrote:

I think this problem was created because when duplicating (left click on sprite -> duplicate) the new sprite goes to a random location. The programmers forgot to make sure it was in the stage.

I can't get a sprite to go completely off stage by duplicating. But I can get some partially off.

I verified that for these sprites partially off stage, the ‘if on edge, bounce’ block is effective.

Could you share a project with the sprites that go all the way off when duplicating?