Since Minecraft 1.21.1, I have been experiencing frequent crashes when using custom lake generation functions added or created by mods. I have been making mods for Minecraft for years, and this issue has become extremely frustrating.
Even in Minecraft 1.21.4, the problem persists. I have noticed this happening in various cases, including when using MCreator to create custom lakes, so I suspect the new update may be affected.
On the screenshot, you can see an example of what happens when the issue occurs. After the error message, you are sent back to the server list, and the game has to be restarted because it no longer functions normally.
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Sounds like you may be experiencing MC-273228, which does affect vanilla as well
Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
A world which had previously been opened with a modified client might be corrupted. Please try reproducing the issue in a newly generated world.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers like Hypixel, please contact them first as they run modified server software.
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Modified versions are not supported on this bug tracker. Try contacting the mod loader developers.