Sprites do not rotate to face the player in Fast graphics mode. they are only visible from one side. this happens in all gamemodes.
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in all previous versions the sprites turned to face the player and did not turn invisible when looked at from the back side of it

This isn't WAI! This is functionality that existed in many previous versions and is now suddenly broken with no mention in the logs. It's clearly an accidental breakage cause by adding something else.
This is a dupe of MC-45470. It seems that the movement code for items dropped on the ground has been broken. In fast mode they are supposed to face the camera, and in fancy mode they are supposed to rotate. They aren't doing either, yet in 14w03b (and ever since 3D items were added before 14w04a) they do.
Blocks still rotate, but items do not (in fancy mode), so it's not just a fast issue. Blocks rotating but items not doesn't make any sense.

Alright, sorry, wrong understanding on my side.

Duplicate of MC-45470