Hopper: java.lang.RuntimeException: Already decorating

When the game tries to populate a chunk with the dead-bush feature, the game is likely to crash. Crash report follows:

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-1130229/

Crash:

java.lang.RuntimeException: Already decorating
	at air.a(SourceFile:21)
	at ail.a(SourceFile:394)
	at ait.a(SourceFile:29)
	at ase.a(SourceFile:173)
	at nq.a(SourceFile:175)
	at arg.a(SourceFile:854)
	at nq.c(SourceFile:104)
	at nq.d(SourceFile:117)
	at aht.b(SourceFile:273)
	at aht.f(SourceFile:268)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 30/01/14 17:40
Description: Exception getting block type in world

java.lang.RuntimeException: Already decorating
	at air.a(SourceFile:21)
	at ail.a(SourceFile:394)
	at ait.a(SourceFile:29)
	at ase.a(SourceFile:173)
	at nq.a(SourceFile:175)
	at arg.a(SourceFile:854)
	at nq.c(SourceFile:104)
	at nq.d(SourceFile:117)
	at aht.b(SourceFile:273)
	at aht.f(SourceFile:268)
	at aht.c(SourceFile:204)
	at aht.d(SourceFile:219)
	at asv.a(SourceFile:26)
	at air.a(SourceFile:141)
	at air.a(SourceFile:27)
	at ail.a(SourceFile:394)
	at ait.a(SourceFile:29)
	at ase.a(SourceFile:173)
	at nq.a(SourceFile:175)
	at arg.a(SourceFile:850)
	at nq.c(SourceFile:104)
	at np.<init>(SourceFile:36)
	at no.a(SourceFile:228)
	at no.d(SourceFile:372)
	at ml.d(SourceFile:227)
	at of.a(SourceFile:289)
	at jv.a(SourceFile:133)
	at jw.a(SourceFile:61)
	at fe.a(SourceFile:163)
	at oa.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.v(SourceFile:545)
	at net.minecraft.server.MinecraftServer.u(SourceFile:461)
	at bzz.u(SourceFile:123)
	at net.minecraft.server.MinecraftServer.run(SourceFile:377)
	at mh.run(SourceFile:647)


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

-- Head --
Stacktrace:
	at air.a(SourceFile:21)
	at ail.a(SourceFile:394)
	at ait.a(SourceFile:29)
	at ase.a(SourceFile:173)
	at nq.a(SourceFile:175)
	at arg.a(SourceFile:854)
	at nq.c(SourceFile:104)
	at nq.d(SourceFile:117)
	at aht.b(SourceFile:273)
	at aht.f(SourceFile:268)

-- Requested block coordinates --
Details:
	Found chunk: true
	Location: World: (2,3,0), Chunk: (at 2,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
	at aht.c(SourceFile:204)
	at aht.d(SourceFile:219)
	at asv.a(SourceFile:26)
	at air.a(SourceFile:141)
	at air.a(SourceFile:27)
	at ail.a(SourceFile:394)
	at ait.a(SourceFile:29)
	at ase.a(SourceFile:173)
	at nq.a(SourceFile:175)
	at arg.a(SourceFile:850)
	at nq.c(SourceFile:104)
	at np.<init>(SourceFile:36)
	at no.a(SourceFile:228)
	at no.d(SourceFile:372)
	at ml.d(SourceFile:227)
	at of.a(SourceFile:289)
	at jv.a(SourceFile:133)
	at jw.a(SourceFile:61)

-- Packet information --
Details:
	Packet name: jw
	Packet debug: 
Stacktrace:
	at fe.a(SourceFile:163)

-- Ticking connection --
Details:
	Connection: fe@60a24605
Stacktrace:
	at oa.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.v(SourceFile:545)
	at net.minecraft.server.MinecraftServer.u(SourceFile:461)
	at bzz.u(SourceFile:123)
	at net.minecraft.server.MinecraftServer.run(SourceFile:377)
	at mh.run(SourceFile:647)

-- System Details --
Details:
	Minecraft Version: 14w05a
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 305342184 bytes (291 MB) / 471859200 bytes (450 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [nu['dinomaxcraft'/13, l='Test command block', x=703,55, y=72,23, z=215,75]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-1130229/54763871/