As the title suggests, whenever I render a world after I setup my camera paths and everything, it turns into a void.
I'm using the latest 1.15 version, everythings up to date.
I need to use shaders for a video for a towny server, so if that's a problem then I don't know what to do.

Here's what it looks like: https://www.youtube.com/watch?v=4WeQeGkff7g&feature=youtu.be
Here's one that actually worked: https://www.youtube.com/watch?v=byvfjKtkUXs

I really need a fix for this, I'm creating a trailer for the server and this is hindering progress

I've experienced a similar issue with the Complementary shaders (Iris+Sodium).
That said, Caveman's videos are no longer available on youtube, so it's difficult to say if it's exactly the same thing.

Here's a short video of what it looks like when rendering with the shaders: https://imgur.com/a/QZrIAPf

There's no problem during gameplay or rendering without shaders - not even flickering.
The render does not place the camera inside blocks.
The render takes place in a Nether Fortress inside a Crimson Forest Biome.