Resolution: Works As Intended
Affects Version/s: Minecraft 16w44a, Minecraft 1.11 Pre-Release 1, Minecraft 1.11, Minecraft 1.11.2, Minecraft 1.12.1, Minecraft 1.12.2, Minecraft 17w43a, Minecraft 17w43b
Fix Version/s: Minecraft 17w49b
Place blocks like the picture.
When opening the trap door, the upward piston should be powered.
The first piston might be a feature because the time is short, however, there's no reason the second piston doesn't get power.
Update: 1.11.2 the first piston be powered but the second piston still doesn't get power.