Alfredo Santoyo

Just to update, this still occurs in 13w39a.

This seems to be fixed in 13w39a. A powered redstone lamp will drop an unpowered redstone lamp using a silk touch pick and no crash occurs.

I'm having the same issue but in Survival. I created a new map in my single player survival world and it gave me a map of my creative world. I am also running on the latest snapshot 13w38c.

Edit: After further testing, it seems as if the map data is being saved across all the worlds. If you create 5 maps in World A and attempt to create new maps in World B, it will 'recreate' the 5 maps you've made until you hit the sixth map in World B. At that point, you will have the correct map but by the same token the next map you create in World A will be that of World B.

Edit 2: This only seems to occur in 13w38b and 13w38c.