How to draw another render target inside a Scene Capture 2D (component)?

I’m trying to create a World Portal, which might also end up rendering itself given some certain camera angles, so it needs to be able to render the RenderTarget that contains the world. At the moment, all it does is render some kind of nothing. It’s hard to explain what it actually does, so attached is a video of it.

How do I solve this issue? I’ve attempted the following:

  • Use a flip-based technique with two RenderTargets used alternatively to render and to draw.
  • Change rendering type from Deferred to Forward.

Edit: Here is the Blueprint

And the material used