RenderTexture not updating each frame, when copying contents with CopyTexture()

Question

Im trying to save 2d textures from a rendertexture using CopyTexture() to capture multiple angle of a 3dobject but for some reason its only returns multiple of the same image, as if its not updating each frame.

  public Texture2D ReadPixels(Texture2D tex)
{
    Graphics.CopyTexture(rt, tex);
    return tex;
}

I know it should be working because it was working with SetPixels() but i changed to copyTexture for performance but now its not updating the rendertexture.

I have tried things like camera.render() tex.apply, rt.create(), RenderTexture.active = rt, rt.release. Seems like these are more for using readpixels.