the nether and the end dimension is seemingly deleted or disabled after exiting the game.

in a fresh world it is fully possbie to enter the nether and the end, but once you've hit save and exit it your world becomes a "expirimental type" world, and thusly the nether and the end is unavailable. Resulting in crashes if you try to enter a portal, and if you attemp the /execute in command it states that no such dimension exist.

if you save and exit while in another dimension the world is corrupted, and will crash anytime you attempt to load it.

just spent about 10* hours in the new release only to be hit by this gamebreaking bug when attempting to enter the nether,

 EDIT: about 7 hours, but still wasted time.

heres the crash report from trying to enter through the portal:

---- Minecraft Crash Report -------- Minecraft Crash Report ----// Don't be sad, have a hug! <3
Time: 05.06.20 04:36Description: Ticking player
java.lang.NullPointerException: Ticking player at ze.a(SourceFile:651) at aoj.bg(SourceFile:1900) at aoj.ad(SourceFile:437) at aov.ad(SourceFile:320) at aoj.j(SourceFile:419) at aov.j(SourceFile:2181) at bdy.j(SourceFile:275) at ze.w_(SourceFile:418) at zv.b(SourceFile:206) at me.a(SourceFile:234) at zu.c(SourceFile:171) at net.minecraft.server.MinecraftServer.b(SourceFile:885) at net.minecraft.server.MinecraftServer.a(SourceFile:812) at eov.a(SourceFile:93) at net.minecraft.server.MinecraftServer.v(SourceFile:671) at net.minecraft.server.MinecraftServer.a(SourceFile:256) at net.minecraft.server.MinecraftServer$$Lambda$3924/1283526188.run(Unknown Source) at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Server threadStacktrace: at ze.a(SourceFile:651) at aoj.bg(SourceFile:1900) at aoj.ad(SourceFile:437) at aov.ad(SourceFile:320) at aoj.j(SourceFile:419) at aov.j(SourceFile:2181) at bdy.j(SourceFile:275)
– Player being ticked --Details: Entity Type: minecraft:player (ze) Entity ID: 124 Entity Name: MY USERNAME Entity's Exact location: 817.15, 74.55, 728.45 Entity's Block location: World: (817,74,728), Chunk: (at 1,4,8 in 51,45; contains blocks 816,0,720 to 831,255,735), Region: (1,1; contains chunks 32,32 to 63,63, blocks 512,0,512 to 1023,255,1023) Entity's Momentum: 0.00, 0.00, 0.00 Entity's Passengers: [] Entity's Vehicle: ~_ERROR~ NullPointerException: nullStacktrace: at ze.w_(SourceFile:418) at zv.b(SourceFile:206) at me.a(SourceFile:234)
– Ticking connection --Details: Connection: me@6bdb5cc1Stacktrace: at zu.c(SourceFile:171) at net.minecraft.server.MinecraftServer.b(SourceFile:885) at net.minecraft.server.MinecraftServer.a(SourceFile:812) at eov.a(SourceFile:93) at net.minecraft.server.MinecraftServer.v(SourceFile:671) at net.minecraft.server.MinecraftServer.a(SourceFile:256) at net.minecraft.server.MinecraftServer$$Lambda$3924/1283526188.run(Unknown Source) at java.lang.Thread.run(Thread.java:745)
– System Details --Details: Minecraft Version: 1.16 Pre-release 1 Minecraft Version ID: 1.16-pre1 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 1059324728 bytes (1010 MB) / 1979711488 bytes (1888 MB) up to 2147483648 bytes (2048 MB) CPUs: 12 JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M Player Count: 1 / 8; [ze['olegermann'/124, l='ServerLevel[coronatimes2020]', x=817.15, y=74.55, z=728.45]] Data Packs: vanilla Type: Integrated Server (map_client.txt) Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.