Minecraft is softlocked after dying

I was playing the Mario Mash up world when after I died when I tried to land after cancelling my elytra. After that, I selected respawn after dying as I expected to appear back in the Nether where my respawn anchor was. But instead, it said, "Generating world" but it was stuck on that for a good 5 minutes before I decided to close Minecraft and shut the system.