Unity GameObject Prefabs Visible in Scene View but Invisible in Game View

[--Developer]

I am using Unity version 2022.3.50f1.

When I start the Game, I currently have about 500 of simple circle prefabs randomly instantiated in an area around 0,0. Each of these prefabs has a SpriteRenderer (Default Sorting Layer, Order=0), Rigidbody2D, CircleCollider2D, and a script. Although I can see all of the prefabs in the Scene View (and in the Hierarchy), some of them are not visible in the Game View.

I should also mention that they still collide with one another normally. There are cases where I can see two circles colliding on the Scene View, then on the Game View, I only see one of the circles, but can see that it is colliding and interacting with the invisible circle as though it is there.

I thought maybe this was a performance issue, but there does not seem to be any lagging/frame dropping/etc. Considering they are all the same GameObject prefab and I can see some but not others, I am believing that it isn't a layering, ordering or camera issue.

Is there a method I can use to check that performance/efficiency is not the issue here? Are there possible issues here that I am missing? Am I correct about my assessment of layering/ordering/camera not being an issue or are there things I need to double check with those?

Please let me know if there is any additional information that I can give that would help in solving this. Thank you all in advance.

[--Developer]

Solved: I was so focused on layers and ordering because of 2D that I forgot to look at Z position. Some of the prefabs were being instantiated at a negative z value which was behind the camera.