[MC-109591] Detecting the block states not saved in meta data does not work

When running /testforblock on iron bars, fences or panes the result is not as expected.

As can be seen in the attachment, I ran

/testforblock ~1 ~ ~ minecraft:iron_bars east=false

and

/testforblock ~1 ~ ~ minecraft:iron_bars east=true

directed at an iron_bars block with the block state east=true,north=false,west=false,south=false

What I expected to happen was the first command to NOT find the block and the second command to do find the block.

Instead, the opposite happened. The first command resulted in the block being found, despite the block state for "east=" not matching my criteria. The second command resulted in the block not being found, giving the message:
"The block at -144, 67, -125 had the data value of minecraft:iron_bars[east=false,north=false,south=false,west=false] (expected: east=true)"

Note: I was told to make an issue separate from ~~MC-109353~~ even though both bugs seem similar.

Affected blocks

Last updated for 1.11.2

Blockstates	Properties
bed[part=foot]	occupied ¹
chorus_plant	north, east, south, west, up, down
dirt[variant=podzol], grass, mycelium	snowy
wooden_door[half=lower], iron_door[half=lower]	hinge, powered
wooden_door[half=upper], iron_door[half=upper]	facing, open
all fences	north, east, south, west
all fence gates	in_wall
fire	north, east, south, west, upper
flower_pot	contents
iron_bars, glass_pane, stained_glass_pane	north, east, south, west
powered_repeater, unpowered_repeater	locked
redstone_wire	north, east, south, west
all stairs	shape
pumpkin_stem, melon_stem	facing
tripwire	north, east, south, west
vine	up
cobblestone_wall	north, east, south, west, up

¹ If the occupied property of the foot part is false, but the head part true

Code analysis

For flower pots, see ~~MC-109353~~