When I open a world with the player near a village, the world opens briefly before crashing. The crash says: java.lang.IllegalArgumentException. The exception was because the game cannot get a property in a Double Stone Slab block, because the values which were top and bottom (I think it meant the top and bottom slabs in a double slab) were apparently non-existent.

What I expected to happen was: The game can retrieve the values of the double slab.

What actually happened: The values appeared to be non-existent, inducing an illegal argument exception.

Crash Report:
Description: Exception ticking world
Details: java.lang.IllegalArgumentException: Cannot get property arh

{name=half, clazz=class als$a, values=[top, bottom]}

as it does not exist in aqv

{block=minecraft:double_stone_slab, properties=[seamless, variant]}

at aqv$a.c(SourceFile:165)
at als.k(SourceFile:50)
at aqv$a.q(SourceFile:388)
at ahu.a(SourceFile:203)
at ahu.a(SourceFile:132)
at lp.d(SourceFile:198)
at net.minecraft.server.MinecraftServer.D(SourceFile:617)
at net.minecraft.server.MinecraftServer.C(SourceFile:553)
at bxz.C(SourceFile:154)
at net.minecraft.server.MinecraftServer.run(SourceFile:457)
at java.lang.Thread.run(Unknown Source)
Stacktrace:
at aqv$a.c(SourceFile:165)
at als.k(SourceFile:50)
at aqv$a.q(SourceFile:388)
at ahu.a(SourceFile:203)
at ahu.a(SourceFile:132)
at lp.d(SourceFile:198)