The bug
/fill
does not send all block updates. GIF demonstration from @unknown.
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Maybe partwise caused by MC-5898

Demonstration of bug using command blocks: https://gfycat.com/PessimisticWealthyJackal
Added to the description, thanks!

in 1.12-pre1

Seems to occur with fill commands if the fill location coordinate places blocks to the positive X or Z of the target command block(s).
Set up a fill command on the ground and place a /say command 2 blocks higher. Now use the following example in the fill command block.
Example:
This works:
/fill ~-1 ~3 ~ ~3 ~ ~ redstone_block
This doesn't work:
/fill ~1 ~3 ~ ~3 ~ ~ redstone_block