So, I'm running the 1.15 Pre-release 1 without any modifications whatsoever. I make my portal to the end, kill the Ender dragon and then when I approach the End gateway, the game decides to save and then crash. All I did was to walk close to it. I later on loaded a backup save and threw an Ender pearl right into the gateway from a distance and it gave me an achievement but again crashed the game...

The crash report reads:

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 2019-11-22 20:13
Description: Rendering Block Entity

java.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$3458/1807433416.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$3458/1807433416.run(Unknown Source)

– Block Entity Details –
Details:
Name: minecraft:end_gateway // bxh
Block: Block{minecraft:end_gateway}
Block location: World: (-1041,67,-353), Chunk: (at 15,4,15 in -66,-23; contains blocks -1056,0,-368 to -1041,255,-353), Region: (-3,-1; contains chunks -96,-32 to -65,-1, blocks -1536,0,-512 to -1025,255,-1)
Block: Block{minecraft:end_gateway}
Block location: World: (-1041,67,-353), Chunk: (at 15,4,15 in -66,-23; contains blocks -1056,0,-368 to -1041,255,-353), Region: (-3,-1; contains chunks -96,-32 to -65,-1, blocks -1536,0,-512 to -1025,255,-1)
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['timmitous'/65, l='MpServer', x=-1041.50, y=59.00, z=-357.50]]
Chunk stats: Client Chunk Cache: 1089, 780
Level dimension: minecraft:the_end
Level name: MpServer
Level seed: 7868853134772363620
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options: {}
Level spawn location: World: (-112,69,-192), Chunk: (at 0,4,0 in -7,-12; contains blocks -112,0,-192 to -97,255,-177), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Level time: 9651398 game time, 12780731 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 7 (amd64) version 6.1
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 803276344 bytes (766 MB) / 1476395008 bytes (1408 MB) up to 2147483648 bytes (2048 MB)
CPUs: 4
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: AMD Radeon (TM) R9 390 Series GL version 4.5.13467 Compatibility Profile Context 21.19.413.0, 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:
Current Language: English (US)
CPU: 4x Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz

I would appreciate any help and wish everyone a great weekend.