End city despawned after relog

Did you try to load some chunks of it in a 1.8 version and then reopen it in 1.9?
It might've messed up the world a bit.

no i did not i was only in minecraft 15w32c

Please force a debug crash by holding F3+C for 10 or more seconds while in-game and attach the report here.

---- Minecraft Crash Report ----
// Would you like a cupcake?

Time: 11-8-15 8:43
Description: Manually triggered debug crash

java.lang.Throwable
	at ayh.s(SourceFile:1566)
	at ayh.at(SourceFile:874)
	at ayh.a(SourceFile:323)
	at net.minecraft.client.main.Main.main(SourceFile:125)


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

-- Head --
Stacktrace:
	at bgj.a(SourceFile:309)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bih['MineTheChicken'/170, l='MpServer', x=9994,69, y=71,51, z=10006,49]]
	Chunk stats: MultiplayerChunkCache: 4225, 4225
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: -841,00,4,00,400,00 - World: (-841,4,400), Chunk: (at 7,0,0 in -53,25; contains blocks -848,0,400 to -833,255,415), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
	Level time: 345728 game time, 151905 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 4 total; [uv['Shulker'/171, l='MpServer', x=10004,50, y=126,00, z=10059,50], uv['Shulker'/172, l='MpServer', x=10007,50, y=126,00, z=10059,50], uv['Shulker'/173, l='MpServer', x=10003,50, y=130,00, z=10058,50], bih['MineTheChicken'/170, l='MpServer', x=9994,69, y=71,51, z=10006,49]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bgj.a(SourceFile:309)
	at ayh.b(SourceFile:2300)
	at ayh.a(SourceFile:332)
	at net.minecraft.client.main.Main.main(SourceFile:125)

-- System Details --
Details:
	Minecraft Version: 15w32c
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 423651856 bytes (404 MB) / 916791296 bytes (874 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 15w32c
	LWJGL: 2.9.4
	OpenGL: GeForce GT 720/PCIe/SSE2 GL version 4.5.0 NVIDIA 347.52, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	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)
	Profiler Position: N/A (disabled)
	CPU: 4x Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz

Is this still an issue in 15w44b? If so, please explain the issue in detail and provide steps to reproduce it.

It works perfectly

Fixed somewhere between 15w32c and 15w44b.

not fixed: MC-96998