Error when converting map to snapshot map.

What I expected to happen was...:
The server, upon loading my SMP map, would update the map to the latest snapshot as always and say "done"

What actually happened was...:
A crash caused by an error stating:
state

java.lang.IllegalArgumentException: Cannot set property ayl

{name=facing, clazz=class dt, values=[north, south, west, east]}

to down on block minecraft:chest, it is not an allowed value

Steps to Reproduce:
1. Use the 14w25a or 14w25b .jar files to launch m y server instead of any older jar or exe file.

Crash report is attached: