Object disappearance

I have an issue where two objects disappear from the game during movement, even though they appear to be performing as intended in the scene. I don’t know if it’s a coding error, an issue with layers, or something else entirely. I’ve already tried fixing it without success. Can someone help me out?

as in the image, one object apears in the camera but at the second of movement it disappears.

Make sure the camera Z’s position is like -20, and your objects Z position be lower (-19 to 0 for example)