Recently I was playing on a multiplayer vanilla server. I came across a bizarre terrain quirk while I was underground, where it seemed as if part of an ocean had suddenly loaded in the area, which was not in the vicinity of a body of water, the wall seemed to have a perfect view of the water, but it could still register that there was a solid wall where there should be. Upon interacting with said wall the game crashed. I was greeted with the following error message

The game crashed whilst tessellating liquid in the world

Error: java.lang.ArrayIndexOutOfBoundsException: 3

When I returned to the server, the area that I had crashed in had been replaced with a completely different biome, as well at a different elevation as being above ground as well.

I got the attached crash report as well to report. From what I got from others I asked, it seems as I quote from the person I asked "that if an array held for instance 5 things then the software asked for a 6th item that did not exist"

On an additional note, I have no idea on how to replicate this issue.

From what I can get at, this might be a bug in the new world generation with oceans. Thank you in advance for looking at this report.

Description: Tesselating liquid in world

java.lang.ArrayIndexOutOfBoundsException: 3
	at aye.d(SourceFile:262)
	at dhg.a(SourceFile:26)
	at dhg.c(SourceFile:45)
	at cuk.a(SourceFile:68)
	at cuj.a(SourceFile:78)
	at cwj.b(SourceFile:191)
	at cwf.a(SourceFile:100)
	at cwf.run(SourceFile:43)
	at java.lang.Thread.run(Thread.java:745)