It crashed when I disabled vanilla with /datapack command.
Commands used:
/datapack disable vanilla
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duplicates 1
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After crashing, the world with the vanilla datapack disabled can no longer be loaded and will crash every time.
When I remove it by the datapack command, the launcher shows: An unexpected error occurred. When I use an NBT editor, it says: Error: java.lang.IllegalStateException: Tag minecraft:water used before it was bound
Hi, you can enable it back without starting minecraft. I had the same problem and dug trough the internet a bit and found a handy little program called NBTExplorer that lets you tweak the level.dat file. With that said, install the program, run it, open the world you want to repair, open level.dat, search for datapacks, go to disabled, cut vanilla and paste on enabled, save it and done! It is now fully working! I hope I could help
Please attach the crash report