Objects flickering when far away from minimap camera

I have a minimap being displayed via a render texture. Each object in my game has a quad associated with it on a layer that this camera displays. The quad is using the Universal Render Pipline/Unlit shader. You can see this is in action in the following gif (minimap is in the bottom right, notice the objects are flickering depending on my position on the map).

Here’s the camera’s settings:

I fixed this by unparenting the minimap camera from the main camera, and adding a follow script that updates the minimap’s transform’s position based on the main camera’s position. I don’t know why this fixed it.