Minecraft freezes when going onto a world

So, I decided to go play my world that I played yesterday, and for some reason, Minecraft is not willing to join the world. On the screen, it freezes/hangs at the "Joining world" screen of joining a world

Here are a few things that may be helpful:

JVM arguments: Allocate 12GB to minecraft
I used to play on it yesterday
Logs:
11:27:20] [Render thread/INFO]: Setting user: Veggieoskibroski
[11:27:25] [Render thread/INFO]: Backend library: LWJGL version 3.2.2 build 10
[11:27:29] [Render thread/INFO]: Narrator library for x64 successfully loaded
[11:27:30] [Render thread/INFO]: Reloading ResourceManager: Default
[11:27:38] [Render thread/INFO]: OpenAL initialized.
[11:27:38] [Render thread/INFO]: Sound engine started
[11:27:39] [Render thread/INFO]: Created: 1024x1024x4 minecraft:textures/atlas/blocks.png-atlas
[11:27:39] [Render thread/INFO]: Created: 256x128x4 minecraft:textures/atlas/signs.png-atlas
[11:27:39] [Render thread/INFO]: Created: 1024x512x4 minecraft:textures/atlas/banner_patterns.png-atlas
[11:27:39] [Render thread/INFO]: Created: 1024x512x4 minecraft:textures/atlas/shield_patterns.png-atlas
[11:27:39] [Render thread/INFO]: Created: 256x256x4 minecraft:textures/atlas/chest.png-atlas
[11:27:39] [Render thread/INFO]: Created: 512x256x4 minecraft:textures/atlas/beds.png-atlas
[11:27:39] [Render thread/INFO]: Created: 512x256x4 minecraft:textures/atlas/shulker_boxes.png-atlas
[11:27:40] [Render thread/INFO]: Created: 256x256x0 minecraft:textures/atlas/particles.png-atlas
[11:27:40] [Render thread/INFO]: Created: 256x256x0 minecraft:textures/atlas/paintings.png-atlas
[11:27:40] [Render thread/INFO]: Created: 256x128x0 minecraft:textures/atlas/mob_effects.png-atlas
[11:27:46] [Render thread/WARN]: Ambiguity between arguments [teleport, destination] and [teleport, targets] with inputs: [Player, 0123, @e, dd12be42-52a9-4a91-a8a1-11c01849e498]
[11:27:46] [Render thread/WARN]: Ambiguity between arguments [teleport, location] and [teleport, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[11:27:46] [Render thread/WARN]: Ambiguity between arguments [teleport, location] and [teleport, targets] with inputs: [0.1 -0.5 .9, 0 0 0]
[11:27:46] [Render thread/WARN]: Ambiguity between arguments [teleport, targets] and [teleport, destination] with inputs: [Player, 0123, dd12be42-52a9-4a91-a8a1-11c01849e498]
[11:27:46] [Render thread/WARN]: Ambiguity between arguments [teleport, targets, location] and [teleport, targets, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[11:27:46] [Server thread/INFO]: Starting integrated minecraft server version 1.15.1
[11:27:46] [Server thread/INFO]: Generating keypair
[11:27:46] [Server thread/INFO]: Reloading ResourceManager: Default
[11:27:46] [Server thread/INFO]: Loaded 6 recipes
[11:27:47] [Server thread/INFO]: Loaded 825 advancements
[11:27:47] [Server thread/INFO]: Preparing start region for dimension minecraft:overworld
[11:27:48] [Render thread/INFO]: Preparing spawn area: 0%
[11:27:48] [Render thread/INFO]: Preparing spawn area: 0%
[11:27:48] [Render thread/INFO]: Preparing spawn area: 32%
[11:27:48] [Render thread/INFO]: Time elapsed: 1219 ms
[11:27:48] [Server thread/INFO]: Changing view distance to 11, from 10
[11:27:49] [Server thread/INFO]: Veggieoskibroski[local:E:f8946022] logged in with entity id 14 at (68.94988978772783, -1.0000002211589268E11, 268.3630927415376)
[11:27:49] [Server thread/INFO]: Veggieoskibroski has joined the gameI used to be able to play this world yesterday. WHat happened?