I have a small RenderTexture that stretched on large object, so texels is near 0.3 of unit. Source for this texture has much more resolution and with gradients.
If source little bit changes its brightness, camera renders it much different. On this video, first is source, second is texture. Also the rendered gradient is not constant.
How can I fix it?
Archive with minimal scene - If you hide source object in inspector and move it, you will see artifacts on result object.