Currently, the game only displays two options for the /fill command instead of the four options in previous versions. 

The following two /fill commands no longer display nor work:

/fill <from: x y z> <to: x y z> <tileName: Block> <tileData: int> replace [replaceTileName: Block] [replaceDataValue: int]

/fill <from: x y z> <to: x y z> <tileName: Block> [tileData: int] [oldBlockHandling: FillMode]

While inputting these commands, the game only registers them as syntax errors regardless of the general order of the format. Instead, the game only registers a strange version of the /fill command as shown in one of the screenshots. This makes it impossible to modify certain aspects of some blocks, such as the color of wool. It has already caused multiple things to break.