Removed the backbuffer check, as it caused a false positive when a second overlay camera is active on top of the FSR2 output.

Turns out blitting to an intermediate render texture works just fine if all FSR2 needs to do is output a color buffer.

Assets/Scripts/Fsr2ImageEffect.cs

@@ -302,14 +302,6 @@ namespace FidelityFX
             _renderCamera.rect = _originalRect;
             _renderCamera.ResetProjectionMatrix();
 
-            if (dest != null && _originalRenderTarget == null)
-            {
-                Debug.LogError("FSR2 is not set to output directly to the backbuffer! Please ensure that FSR2 is the final pass in the image effects chain.");
-                Graphics.Blit(src, dest);
-                enabled = false;
-                return;
-            }
-            
             // Update the input resource descriptions
             _dispatchDescription.InputResourceSize = new Vector2Int(src.width, src.height);