If you look up to the End Gateway, your game crashes. It's really disturbing and I lost my Survival World in which I played half a year. The crash report:

---- Minecraft Crash Report ----

// I bet Cylons wouldn't have this problem.Time: 23.11.19 19:34
Description: Rendering Block Entityjava.lang.IndexOutOfBoundsException: Index: 16, Size: 16
{{ at java.util.ArrayList.rangeCheck(ArrayList.java:653)}}
{{ at java.util.ArrayList.get(ArrayList.java:429)}}
{{ at dsy.a(SourceFile:41)}}
{{ at dsx.a(SourceFile:30)}}
{{ at dsx.a(SourceFile:11)}}
{{ at dsk.a(SourceFile:106)}}
{{ at dsk.b(SourceFile:95)}}
{{ at dsk$$Lambda$3821/1215483981.run(Unknown Source)}}
{{ at dsk.a(SourceFile:127)}}
{{ at dsk.a(SourceFile:95)}}
{{ at dqm.a(SourceFile:1180)}}
{{ at dqi.a(SourceFile:719)}}
{{ at dqi.a(SourceFile:549)}}
{{ at dbj.d(SourceFile:941)}}
{{ at dbj.b(SourceFile:576)}}
{{ at net.minecraft.client.main.Main.main(SourceFile:202)}}
A detailed walkthrough of the error, its code path and all known details is as follows:
--------------------------------------------------------------------------------------- Head --
Thread: Render thread
Stacktrace:
{{ at java.util.ArrayList.rangeCheck(ArrayList.java:653)}}
{{ at java.util.ArrayList.get(ArrayList.java:429)}}
{{ at dsy.a(SourceFile:41)}}
{{ at dsx.a(SourceFile:30)}}
{{ at dsx.a(SourceFile:11)}}
{{ at dsk.a(SourceFile:106)}}
{{ at dsk.b(SourceFile:95)}}
{{ at dsk$$Lambda$3821/1215483981.run(Unknown Source)}}-- Block Entity Details --
Details:
{{ Name: minecraft:end_gateway // bxh}}
{{ Block: Block{minecraft:end_gateway}}}
{{ Block location: World: (-92,75,29), Chunk: (at 4,4,13 in -6,1; contains blocks -96,0,16 to -81,255,31), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)}}
{{ Block: Block{minecraft:end_gateway}}}
{{ Block location: World: (-92,75,29), Chunk: (at 4,4,13 in -6,1; contains blocks -96,0,16 to -81,255,31), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)}}
Stacktrace:
{{ at dsk.a(SourceFile:127)}}
{{ at dsk.a(SourceFile:95)}}
{{ at dqm.a(SourceFile:1180)}}
{{ at dqi.a(SourceFile:719)}}-- Affected level --
Details:
{{ All players: 1 total; [dpw['Leonlloyd12'/476, l='MpServer', x=-89.63, y=62.75, z=22.43]]}}
{{ Chunk stats: Client Chunk Cache: 841, 2}}
{{ Level dimension: minecraft:the_end}}
{{ Level name: MpServer}}
{{ Level seed: -5917961062213365770}}
{{ Level generator: ID 00 - default, ver 1. Features enabled: false}}
{{ Level generator options: {}}}
{{ Level spawn location: World: (208,63,-74), Chunk: (at 0,3,6 in 13,-5; contains blocks 208,0,-80 to 223,255,-65), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)}}
{{ Level time: 1276710 game time, 1935209 day time}}
{{ Level storage version: 0x00000 - Unknown?}}
{{ Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)}}
{{ Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false}}
{{ Server brand: vanilla}}
{{ Server type: Integrated singleplayer server}}
Stacktrace:
{{ at dnj.a(SourceFile:442)}}
{{ at dbj.c(SourceFile:1865)}}
{{ at dbj.b(SourceFile:591)}}
{{ at net.minecraft.client.main.Main.main(SourceFile:202)}}-- System Details --
Details:
{{ Minecraft Version: 1.15 Pre-release 1}}
{{ Minecraft Version ID: 1.15-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: 593268000 bytes (565 MB) / 1610612736 bytes (1536 MB) up to 2147483648 bytes (2048 MB)}}
{{ CPUs: 8}}
{{ 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}}
{{ Launched Version: 1.15-pre1}}
{{ Backend library: LWJGL version 3.2.2 build 10}}
{{ Backend API: Radeon RX 580 Series GL version 4.6.13559 Compatibility Profile Context 26.20.12028.2, ATI Technologies Inc.}}
{{ GL Caps: Using framebuffer using OpenGL 3.0}}
{{ Using VBOs: Yes}}
{{ Is Modded: Probably not. Jar signature remains and client brand is untouched.}}
{{ Type: Client (map_client.txt)}}
{{ Resource Packs: vanilla}}
{{ Current Language: English (US)}}
{{ CPU: 8x AMD Ryzen 5 2400G with Radeon Vega Graphics}}