I am hoping to see if someone has run into a similar problem.
Old worlds load just fine but new worlds load empty and I end up just dying over and over.
There are exceptions though in the sky, there are some structures, when looking at the overlay, it tells me the biome I am in and changes as I move around.
Tried taking off optifine, no luck, not sure what mod would be causing this, my modpack worked just fine before.
Not sure what to look for in the logs either.
UPDATE: Old worlds no longer load new chunks beyond what I discovered when looking at the map
have 322 mods they worked magically well together until now.