Better Portals version: 0.1.3

When portals are nested physically, the inner portal views visible through a portal view are not rendered... I'm sorry, I had to mention it; you know it was only a matter of time before someone asked for a lag machine. 😜

could probably have a config option for the maximum number of nested portals to render ;)

Nested portals should already work on the rendering side of things.
The main issue with them currently is that they might keep themselves loaded in subtle ways even if the player walks away. I haven't though about the details of whether that's actually the case nor how to fix it, instead I've just disabled them for now.

Well, this is your fault. BP 0.2 supports recursively rendering portals and now #123 is a thing.