Nether only generated a single chunk in a Hardcore Amplified world using seed [-971255340339126519] and I was unable to place blocks and mined blocks did not drop items.

After entering the Nether, the game would not save when trying to leave through the portal or closing the game forcing me to force quit the game.

This issue persisted after deleting the DIM-1 file and re-entering the Nether.

I was also unable to recreate the issue in a separate Creative mode world with the same seed and generation conditions, the Nether generated normally in that game-mode.