I downloaded a custom world from Planet Minecraft that looked dope. I didn't know how to do it so I followed this awesome youtuber 'The Breakdown' video on how to do it by the letter and when I clicked on it since it had showed up in my worlds list because I had done everything correctly (I thought) It loaded all the way up until it reached the dirt background with the square in the middle and it said 100%. I so far haven't been able to successfully even enter the world yet. It's just stuck on that. It wouldn't even let me close Minecraft so I had to force close it with task manager. I tried again a few times and nothing has happened I just keep having to do that. The map that I downloaded was made in/for 1.12 so I knew it had to update to 1.16.4 but it just keeps doing this. When I went back into Minecraft I checked what version it was to see if it had updated and it said it was at 1.16.4 so I don't know what's wrong with it. If anyone knows can you help? Thanks so much!!!!!!!