Nether won't load in upgraded worlds

I had created this world on the snapshot before this week's snapshot. I had not gone to the nether or even lit a portal in the earlier snapshot. When I entered the portal it only loaded one chunk, it was raining, and nothing else could load. When I had mined blocks it didn't drop anything, the game would let me walk around but it was acting like it was under an immense amount of lag. The portal wouldn't work either, it would display the effect but wouldn't let me back into the over-world. i have a few snapshots but none of breaking blocks unfortunately. I'm not entirely worried right now, but it would be nice if it gets fixed in the future from general bug fixes.

P.S. It wouldn't save and close my world when i entered and I would have to go into my task manager to force the game to close. This could corrupt my world so I have no nether for now.