In both gamemodes, placing a piston while facing east then powering it will allow you to talk through the piston head.
Walking through these piston while facing north makes the heads act as if they are a full block, meaning you can't walk to the piston arm itself.
What I expected to happen was...:
What happens when the piston faces any other direction, you cannot walk through it.
What actually happened was...:
You could walk through it
Steps to Reproduce:
1. Face EAST
2. Place any kind of piston, one on top of each other
3. Power both pistons in any way
4. Face the arm from the south
5. Walk southwest so you are stuck between the arm and head of the piston
6. Walk southeast into the piston head
Related issues
is duplicated by
MC-3496
Piston hitbox
MC-5386
Piston Arm Collision Clipping Bug
MC-5967
Walk through extended piston arms, sticky and normal.
MC-6360
In Piston
MC-7975
Walking through open piston and incorrect hitbox.
MC-8622
Piston Extended Arm Glitch
MC-10056
bad piston head hitbox
MC-11641
Collision bug with extended pistons
MC-12060
Piston's Hitbox
MC-17550
Pistons
MC-32378
Piston Noclip
MC-47862
Player able to pass through the arms of west-facing pistons
MC-52488
Walking through a piston
MC-53498
Walk through pistons
MC-54051
You can walk through an extended piston head that's facing west
MC-54589
being able to walk through piston extenders
MC-56320
you can fall through extend piston if it extend to west and you walk west to east
MC-61410
Ability to Walk Through Pistons
MC-61420
When you are very close to a piston, it run through you. Sometimes happens, sometimes not.
MC-64115
Pistonhead no-clip Bug
MC-64244
Clipping errors
MC-69092
Extended Piston Hitbox Bug
MC-77557
When there is an extended piston you can walk through the line that connects the piston.
MC-81616
Player/s Glitching through piston heads
MC-85778
When sprinting over piston arms you can fall through
MC-87106
Walk Through Retracting Pistons
Attachments
Comments
migrated
migrated
Confirmed in 13w04a.
rydian
Confirmed to still happen in 13w09b.
I first found out about it by falling through while walking on top. XD
EDIT: I meant b.
migrated
This bug breaks farms like the tripwire enderman farm because mobs get stuck inside the piston arm, so the pistons are constantly powered (because the mob steps on the pressure plate) and never retract. Voted.
migrated
confirmed in 13w21b. Walking south allows player (in any gamemode) and some mobs to pass through the "arm". Walking north will only allow player to pass through if they jump near the piston first.
migrated
Tested it in 1.6.1, still here.
migrated
Also in 1.6.2; I just tested it.
It's very easy to do if you walk north or south into the piston arm, then turn to face the piston box a bit (it never works when turning to face the arm).
Also, you're able to strafe back and forth through the arm when facing east or west if you're in the right position.
Ezekiel
Is this still a concern in the latest Minecraft version 14w04b? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
migrated
Confirmed in 14w04b: behavior appears to be identical to previous versions.
migrated
Confirmed for 14w21b.
migrated
Confirmed for 14w25b.
migrated
Still in 14w30c (MC-64115)
migrated
Confirmed for 1.8 prerelease 2
Please, fix it before release!!
migrated
Confirmed for 1.8pre2.
rydian
Tested in 1.8.1-pre1, and I was not able to recreate it.
Piston arms facing west (according to the 1.8 debug menu's block info) have a differently-shaped hitbox than the other arms, but none of them can be walked through anymore from what I tried.
migrated
Can confirm what George Gates commented.
The piston arm's hitbox has been adjusted, but is still malformed.
kumasasa
Was this fixed in 1.8 or 1.8-pre1 ?
migrated
Only 1.8.1-pre1 has the adjusted hitbox (not 1.8). 1.8.1-pre2 is back to the old malformed hitbox.
Edit: version fix 1.8-pre1 => 1.8.1-pre1
kumasasa
Derp. Meant 1.8.1-pre1, not 1.8-pre1.
But cannot confirm in 1.8.1-pre2, see screenshot
migrated
The piston in the image you just posted is facing east, however the faulty piston is facing west (it is placed while facing east).
I double checked using the sandstone textures, however I really tired right now, maybe I overlooked something or I'm missing the point of your picture.
Not that it really matters, it should be easy enough to find if you place 4 pistons around a redstone torch.
migrated
Can confirm fixed for pistons facing east, but it now occurs with a piston facing west.
kumasasa
Ok, got it.
migrated
Confirmed in 15w34d.
rydian
Can't reproduce anymore in 15w45a, was probably fixed earlier.
migrated
Fixed somewhere between 15w34d and 15w44b, probably with MC-1635.
migrated
Incorrect, Piston arms don't let go pass through when facing directions with the exception of facing west. Which means only Facing West will let player go through.
migrated
So this is still happening in 16w02a?
migrated
I tested in 16w02a and the current 16w03a, both in all cardinal directions. I did not run into the bug.