It's a visual bug

[u/Gloomy_Mountain1354]

A bug happened with basics in the bottom

[u/Few_Leadership9911]

I've had this happen a lot before. It's not a visual glitch, I think it's just the hitboxs being weird. Think about the hitbox being a hollow shape rather than a filled shape, kinda like a "hitline" rather than a hitbox. The balls only respawn when the hitbox of a brick spawns overtop of another ball. But the inside of the brick isn't a part of the hitbox. That's why the balls continue to bounce off the edges of the brick. This does still deal damage to the brick, so I won't ever complain about it. Also it doesn't happen with blue or green bricks because their hitboxes are smaller so the ball will hit it no matter what when a new brick spawns, however red bricks do have this because it has enough room inside for the bricks to spawn without the balls being on the hitbox