I guess I will try submitting a pull request.
Is there any this is added in 4.12.x if I submit the pr? or 4.13 at best? Q_Q
Btw, is it a good idea to change the render target size at runtime? (that would only need to happen when changing resolution, not each tick) or is that not recommended?
Is this the reason why planar reflections use FPlanarReflectionRenderTarget?