A pressure plate on a slab will not open a trapdoor, but will close an open one. Doors work as expected, pressure plate on a slab will open them. wood and stone pressure plates act the same, and all types of slabs the same.
What I expected to happen was...:
I thought that a pressure plate on a slab would open the trap door
What actually happened was...:
the trap door did not open
Steps to Reproduce:
1. put down a slab level with the top of a block
2. place a pressure plate on the slab
3. place a trap door on the same level, on the slab or appropriate block
4. walk on to the pressure plate
5. an open trapdoor will close, a closed one will do nothing.
Linked issues
is duplicated by
MC-11173
Door closes on near redstone update
MC-13014
trapdoors dont receive power on half steps
MC-14859
Trap Door & Doors Closes On Redstone Update
MC-16715
Fence gates close with pistons
MC-18220
Tripwire hook send redstone signal door
MC-19535
Redstone inconsistently affects track direction
MC-25919
Trap Doors close on the block trip wire hooks are on.
MC-29839
Placing redstone dust on a block closes opened trapdoors attached to it
MC-41049
When an unpowered redstone switch is placed next an open door and then removed it will close it.
MC-44238
Trapdoors open and close by themself
MC-46392
Tripwirehook open Trapdoor
MC-46561
Redstone signal on barrier to trapdoors
MC-50684
Redstone Door Bug
MC-51174
Redstone - Wood Trapdoor
MC-51631
Junction rail incorrectly returning to the "off state"
MC-59765
Redstone repeater under open trapdoor
MC-77454
Trapdoor Opening Without Power
MC-92702
Repeater powers trapdoors when inactive
MC-105361
Trapdoors When the Block Below Them Updates
MC-117702
Trapdoor closes on redstone update (no matter which type)
MC-119408
open wooden trapdoors close when updated by redstone
relates to
MC-114965
Placed tripwire hook updates blocks around opposite facing tripwire hook on same axis
MC-7344
Trapdoor is closed when redstone repeater is one block below and powered.
MC-76111
Doors behave inconsistently when receiving updates
MC-84173
Trapdoors get a redstone update when being pushed/pulled next to a power source, but not when being pushed/pulled away from it
Comments
CubeTheThird
Since the top-slab is not a whole block, I would think it shouldn't transmit redstone signal at all. So, what I would expect to happen would be that the trap door doesn't move at all.
I think the bug here is that an open one is closing.
Main issue: any redstone update close to a door/trapdoor/fence gates causes it to update.
Same with wooden doors.
I just did some tests with other "block updates", since in a certain way it does make sense that a (trap)door which has been put into a "bad" state by a player would change to the "right" state when receiving a block update.
There are some inconsistencies. When I open an unpowered (trap)door (so by a player) it will close again if there is a redstone block update, but not if there are other block updates like placing/removing a block. But when it is the other way around, so when I close a powered (trap)door it will open again with any block update.
Confirmed in 13w19a.
Very annoying behavior. Not very usable in redstone contraptions. Should be fixed ASAP!
Device to replicate this:
! = Door/Trapdoor/Fence Gate
O = Redstone
+ = Block
8 = Button
!
+
OOOOOOO+8
Open the door/trapdoor/fence gate and press the button.
Can this issue please be updated to include 1.6.2 and Survival mode as well?
Fixed only for doors in 14w11b.
muzikbike
Affects 18w46a (at least the trapdoor thing does - why are there like three bug reports crammed into one here?)
RedCMD
Can confirm fixed in 1.14 for trapdoors/doors/fence gates
NeunEinser
The report is only about trapdoors, so fixed?
FaRo1
I just tested it: Upper slab, pressure plate on top, trap door next to the pressure plate, open trap door manually, step on pressure plate, step off pressure plate. Result: Trap door closes.
The case in the screenshots does indeed not apply anymore, can someone remove them, please?
@unknown What do you mean with three reports in one?
muzikbike
Can I have my ownership of this ticket revoked? Don't want to deal with it anymore.
Jack McKalling
The issue described in this ticket is actually the trapdoor closing to the pressure plate, as it not opening through the slab is intended. This was finally fixed in a 1.13 snapshot, I presume due to new blockstates.
Can confirm.