[MC-45826] Item frames pop off / rendered on wrong side of block when upgrading to 14w04b

Moderator Note

You may continue to experience item frames dropping if you loaded your world in a snapshot between 1.7.4 and 14w05b

Please keep in mind snapshots are development (testing) versions, it is recommended you reload the world from a pre-snapshot save.

When upgrading a map previously run in 14w04a as well as the backup in 14w02c all the item frames in loaded chunks, as well as all items inside them were on the ground as items.