I wanted to make a custom dimension for a datapack I was working on, and once I made sure everything was working perfectly, I stopped work for the day. Next day, I wake up to see that for some reason, I can see the outlines of blocks in the dimension and interact with them, but they were invisible in any other shape or form, and I also noticed that it was impossible to generate new chunks in the dimension. After this, I quickly checked the output logs and the errors below is what I see whenever I try to go into my world... Not only that, but after a short amount of time, the game starts going past all of the limitations you set on the launch of the game, using up ridiculous amounts of memory, all the while refusing to crash. I usually set the memory to 4 GBs for my installations, while in these cases it can use all of my available RAM, or usually 8 GBs setting the RAM usage on a constant 95%. Trying to exit and save the world yields the same results.

15:39:15.865
net.minecraft.class_5485
main
Feature: Not a JSON object: null; Not a JSON object: "minecraft:fossil"; Not a JSON object: "minecraft:forest_rock"; Not a JSON object: "minecraft:lake_water"
15:39:15.874
net.minecraft.class_5485
main
Feature: Not a JSON object: null; Not a JSON object: "minecraft:spring_water"; Not a JSON object: "minecraft:spring_water"; Not a JSON object: "minecraft:spring_water"; Not a JSON object: "minecraft:spring_water"; Not a JSON object: "minecraft:lake_water"; Not a JSON object: "minecraft:lake_water"; Not a JSON object: "minecraft:lake_water"; Not a JSON object: "minecraft:lake_water"; Not a JSON object: "minecraft:ore_infested"; Not a JSON object: "minecraft:ore_infested"; Not a JSON object: "minecraft:ore_redstone"; Not a JSON object: "minecraft:ore_lapis"; Not a JSON object: "minecraft:ore_iron"; Not a JSON object: "minecraft:ore_infested"; Not a JSON object: "minecraft:ore_gravel"; Not a JSON object: "minecraft:ore_granite"; Not a JSON object: "minecraft:ore_gold"; Not a JSON object: "minecraft:ore_emerald"; Not a JSON object: "minecraft:ore_dirt"; Not a JSON object: "minecraft:ore_diorite"; Not a JSON object: "minecraft:ore_diamond"; Not a JSON object: "minecraft:ore_coal"; Not a JSON object: "minecraft:ore_andesite"
15:39:15.948
net.minecraft.class_5485
main
Feature: Not a JSON object: null; Not a JSON object: "minecraft:lake_lava"; Not a JSON object: "minecraft:lake_water"; Not a JSON object: "minecraft:lake_water"; Not a JSON object: "minecraft:lake_water"; Not a JSON object: "minecraft:lake_water"; Not a JSON object: "minecraft:spring_water"; Not a JSON object: "minecraft:spring_water"; Not a JSON object: "minecraft:spring_water"; Not a JSON object: "minecraft:spring_water"; Not a JSON object: "minecraft:fossil"; Not a JSON object: "minecraft:forest_rock"; Not a JSON object: "minecraft:monster_room"
15:39:15.948
net.minecraft.class_5485
main
Feature: Not a JSON object: null; Not a JSON object: "minecraft:patch_brown_mushroom"; Not a JSON object: "minecraft:patch_red_mushroom"; Not a JSON object: "minecraft:patch_dead_bush_2"; Not a JSON object: "minecraft:patch_dead_bush"
15:39:15.951
net.minecraft.class_5485
main
Feature: Not a JSON object: null; Not a JSON object: "minecraft:ore_infested"; Not a JSON object: "minecraft:ore_redstone"; Not a JSON object: "minecraft:ore_lapis"; Not a JSON object: "minecraft:ore_iron"; Not a JSON object: "minecraft:ore_infested"; Not a JSON object: "minecraft:ore_gravel"; Not a JSON object: "minecraft:ore_granite"; Not a JSON object: "minecraft:ore_gold"; Not a JSON object: "minecraft:ore_emerald"; Not a JSON object: "minecraft:ore_dirt"; Not a JSON object: "minecraft:ore_diorite"; Not a JSON object: "minecraft:ore_diamond"; Not a JSON object: "minecraft:ore_coal"; Not a JSON object: "minecraft:ore_andesite"
15:39:15.952
net.minecraft.class_5485
main
Feature: Not a JSON object: null; Not a JSON object: "minecraft:fossil"; Not a JSON object: "minecraft:forest_rock"
15:39:15.952
net.minecraft.class_5483
main
Spawn data: Not a JSON object: null