mc_Dandy

Yes, I am on newest drivers.

Looks like aither reinstalling launcher or renaming minecraft launcher fixed that

It is vanilla.
No water or lava is not affected
Does not look like graphical settings affect it
I tried both. Happens on both.

Happens on both systems I have

Ram is 64GB DDR5, CPU is Intel core I9-13950HX, GPU is Nvidia RTX 4080 Laptop, Drivers are 610.62

Ram is 128GB DDR5, CPU is AMD ryzen 9 9950X3D; GPU is Nvidia RTX 5090 Drivers 610.62 and AMD Reoden integrated GPU. Problem is on both (OpenGL on integrated, vulkan on external)

I hope it is not corrupted files. Should not be, I just downloaded the version.
Only think I remember changing is view distance.

So did some more testing. It is not position dependent but GPU dependent. On RTX5090 I can only see slight pixel misaligment (grass shownig between redsotne pixels). On RTX4080 Laptop I see misaligned pixels and parts of the block disappearing (shown in video uploaded before)

In 1.15 pre 2 it no longer crash. The world is corrupted. It appers to be the same world as in MC-133815.

 Server log:

1.14 did not crash. Some errors apper, becouse of world got corrupted in very old version (1.13 pre 10).

Didn´t know it was possible

It works in the b snapshot with spawn egg Didn´t tested with command

As i sed in description I cannot reproduce it.

Thought it was a bug.

found tree generated on patch of sand in pre 10

Caused by float rounding error.

Did not happen anymore. This was only one time.

Will attach when I get to pc. Its 1:41 and I am going to sleep.

I am sure that I have privilige to write. Maybe it was that I forgot pspad opened and it was gathering informations to display file after external edit and maybe locked it for moment.

Created in pre 10.

Why you added the bug report to Enviroment ?

It's becouse of world gen code changes.

I meant - i will create a world with wanted generator settings and copy level.dat to serverś world

I do not use any external tool. I chrange the generator settings in server configuration file

...
generator-settings=3;1*minecraft\:bedrock,254*minecraft\:stone,1*minecraft\:bedrock;2;

• this do not affects the world generation.

...

....
...
level-type=FLAT

generator type will chrange, but the generator options will not affect it.
In some older snapshot of 1.9 version It generated correctly, and after updating It chranged.

Do you mean If i replace level.dat with file from world with wanted generation settings it will work?