If can’t stack the camera, then the upscaled render texture will affect the display of the text, and the small size text cannot be displayed and cleared. Please think of a way to render only the main camera. Thank you.
I have a workaround for this issue, although it’s not great. I’ve created two extra Cameras, one with a PixelPerfectCamera for the gameplay and one for rendering canvases, and pipe both of them to RenderTextures that I then have my MainCamera render.