[MC-55686] Clone with move causes crash if structure includes chests or trapped chests

When using the new move command (clone command with move mode) I keep getting crashes if my structure includes chests or trapped chests. The error seems to be a " awy cannot be cast to awn" error. Crash report included.

Just to be clear it's not tile entities in general. I'm able to include furnaces just fine. Ender Chests however turn invisible.

Time: 23/05/14 3:36 AM
Description: Ticking block entity

java.lang.ClassCastException: awy cannot be cast to awn
	at awn.n(SourceFile:213)
	at awn.m(SourceFile:250)
	at alk.i(SourceFile:1363)
	at bjs.p(SourceFile:1697)
	at bjs.ah(SourceFile:843)
	at bjs.f(SourceFile:797)
	at net.minecraft.client.main.Main.main(SourceFile:121)
Details:
	Name: Chest // awn
	Block type: ID #164 (tile.stairsWoodDarkOak // aui)
	Block data value: 1 / 0x1 / 0b0001
	Block location: World: (-38,77,31), Chunk: (at 10,4,15 in -3,1; contains blocks -48,0,16 to -33,255,31), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Actual block type: ID #164 (tile.stairsWoodDarkOak // aui)
	Actual block data value: 1 / 0x1 / 0b0001