/clear [player] [identifier] does not behave correctly for blocks of data values above 0

Is_game_rule_true and Is_game_rule_false filters don't work

Powered NBT tag doesn't work on structure blocks

Entities and Tile entities become translucent based on where your looking

World crashes on load

Placing redstone under slab on same block destroys the slab

Place torch on underside of block

'Replace' in 'Fill' using /execute in a command block fails

Staying outside border makes you unable to move at all