I tried to open a world,which I last opened it on January,2023,and when I tried to reopen it,it crashes
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Has the world been decreased in height by a data pack at any point? (MC-276585)
B4dAtMC, Java Edition is supposed to works fine when updating, all data formats are updated by the game. Changing version numbers should not cause the game to break (unless you downgrade). Additioanlly, no commands are provided, so why do you think commands are a problem in this? Command syntax changing doesn't cause crashes.
I can't reproduce this with a fresh 1.19.3 world, can you please attach a copy of your affected world from before the upgrade?
Uhh...I'm a Chinese student and is busy with Gaokao,so I hardly have time to provide a copy(backup)......
This happens cause the game detects an incompatible version of Java and cause Minecraft attempts to use functions and commands that aren't in the Java version.