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So. if you find bugs, you report it. So.

Ya. Idk where to post it.

So i thought i help out people testing 1.13/or the minecraft devs looking for bugs

When loading worlds that existed in 1.12.2 And then loading them into 1.13 18w07a it works fine, til u load new chunks.

(I Was in a 18w07c testing bugs, to find things, but it happens in 07a and 07c.) (tested on both)

This was the log report from 18w07c when loading a new chunk. (Whoever is a admin, or is smart, get this to, well idk someone important, to make sure this doesn't effect future worlds when 1.13 is out.)

---- Minecraft Crash Report ----
// But it works on my machine.

Time: 2/19/18 12:35 AM
Description: Exception generating new chunk

java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: bound must be positive
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2237)
at rw.c(SourceFile:129)
at sd.a(SourceFile:84)
at se.c(SourceFile:143)
at rx.k_(SourceFile:219)
at net.minecraft.server.MinecraftServer.w(SourceFile:694)
at net.minecraft.server.MinecraftServer.v(SourceFile:627)
at cvz.v(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:532)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: bound must be positive
at java.util.Random.nextInt(Random.java:388)
at bnm.a(SourceFile:19)
at bnm.a(SourceFile:12)
at bjc.a(SourceFile:27)
at aug.a(SourceFile:416)
at bin.b(SourceFile:123)
at sk.a(SourceFile:12)
at sj.a(SourceFile:33)
at bgz.a(SourceFile:83)
at so.a(SourceFile:54)
at so.a(SourceFile:23)
at zk$a.a(SourceFile:143)
at zk$a$$Lambda$959/2038653269.apply(Unknown Source)
at java.util.concurrent.CompletableFuture$AsyncApply.exec(CompletableFuture.java:501)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:902)
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644)
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Client thread
Stacktrace:
at rw.a(SourceFile:178)

-- Chunk to be generated --
Details:
Location: 2,-23
Position hash: -98784247806
Generator: [email protected]
Stacktrace:
at rw.a(SourceFile:178)
at rw.c(SourceFile:132)
at sd.a(SourceFile:84)
at se.c(SourceFile:143)
at rx.k_(SourceFile:219)
at net.minecraft.server.MinecraftServer.w(SourceFile:694)
at net.minecraft.server.MinecraftServer.v(SourceFile:627)
at cvz.v(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:532)
at java.lang.Thread.run(Thread.java:745)

-- Affected level --
Details:
Level name: Citadle Castle
All players: 1 total; [rz['DarkMinecraftia'/82, l='Citadle Castle', x=-48.23, y=81.38, z=-189.78]]
Chunk stats: ServerChunkCache: 1207 Drop: 0
Level seed: 1967850400
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (-18,64,213), Chunk: (at 14,4,5 in -2,13; contains blocks -32,0,208 to -17,255,223), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 470976 game time, 66712 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 6568 (now: false), thunder time: 36660 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true

-- System Details --
Details:
Minecraft Version: 18w07c
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 306050784 bytes (291 MB) / 603979776 bytes (576 MB) up to 1073741824 bytes (1024 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [rz['DarkMinecraftia'/82, l='Citadle Castle', x=-48.23, y=81.38, z=-189.78]]
Data Packs: vanilla
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.
#@[email protected]# Game crashed! Crash report saved to: #@[email protected]# C:\Users\zakma\AppData\Roaming\.minecraft\crash-reports\crash-2018-02-19_00.35.38-server.txt
<log4j:Event logger="net.minecraft.server.MinecraftServer" timestamp="1519018538417" level="INFO" thread="Client Shutdown Thread">
<log4j:Message><![CDATA[Stopping server]]></log4j:Message>
</log4j:Event>

Now idk what any of it means, but from reading it, it seems like the world didnt merge correctly.

(Also i backed up my save, it seems the world won't even load anymore, onto 18w07c, like i load back in, instantly crashing, saying the same thing.)

So Ya, enjoy Minecrafters!

Don't expect old worlds to work perfectly in the development builds, report any bugs to bugs.mojang.com