[Bug Report] Rendering an Arrow component in game will cause Postprocess to stop rendering

This one took me a bit to track down but I was having issues with my post SSR and AO not rendering sometimes seemingly at random.

Turned out the culprit was a debug Arrow component I was drawing. I reproed this in a clean BP First Person template build.

To repro:

  1. Create a scene that demonstrates SSR and SSAO
  2. Create a new Blueprint with a single Arrow component.
  3. Set the Arrow to be visible in game.
  4. Enter the game using PIE or Standalone.
  5. Look around and notice that when the Arrow BP is on screen that SSR’s and SSAO stop working.