[MC-1230] Players and mobs can fall through extending/retracting pistons Created: 29/Oct/12  Updated: 27/May/24  Resolved: 15/Sep/15

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Minecraft 1.4.2, Minecraft 1.4.7, Snapshot 13w05b, Minecraft 1.5, Snapshot 13w11a, Minecraft 1.5.1, Minecraft 1.7.2, Minecraft 1.7.4, Minecraft 14w02c, Minecraft 14w03b, Minecraft 14w04a, Minecraft 1.7.5, Minecraft 1.7.9, Minecraft 14w18b, Minecraft 14w21b, Minecraft 1.8, Minecraft 1.8.1-pre2, Minecraft 1.8.8, Minecraft 15w36d, Minecraft 15w37a
Fix Version/s: Minecraft 15w38a

Type: Bug
Reporter: Indigo Assignee: [Mojang] Grum (Erik Broes)
Resolution: Fixed Votes: 5
Labels: mob, piston, player
Environment:

Windows 7 64 bit, Java 7 (latest version)


Issue Links:
Cloners
is cloned by MC-159503 Entities clip through blocks being sp... Open
Duplicate
is duplicated by MC-38207 mobs getting stuck in pistons Resolved
is duplicated by MC-52281 Yet another piston bug Resolved
is duplicated by MC-55310 Player entity randomly falls when sta... Resolved
is duplicated by MC-56320 you can fall through extend piston if... Resolved
is duplicated by MC-68512 Non-player entities consistently fall... Resolved
is duplicated by MC-73871 You Fall Trough Moving Slime Block Ma... Resolved
is duplicated by MC-75574 Mobs, boats and minecarts fall throug... Resolved
is duplicated by MC-77789 When you land on a slimeblock being r... Resolved
is duplicated by MC-82548 Sticky piston + Slime block Resolved
Relates
relates to MC-54494 Flying (creative) through slime blocks Resolved
CHK:
Confirmation Status: Confirmed
Game Mode: Creative

 Description   

Player + retracting: http://i.imgur.com/MeZHz.gif

Mob + extending: http://i.imgur.com/2DarX.gif



 Comments   
Comment by An_yMiner [ 06/Oct/16 ]

I just found out that shifting floors work again. (Mobs fall through moving blocks; Players don't fall but have trouble moving)

Comment by An_yMiner [ 06/Oct/16 ]

@An_yMiner fixed in Minecraft 16w40a

Comment by user-f2760 (Inactive) [ 31/Mar/16 ]

when MC-89030 is fixed, and this is still an issue, then this will be reopened, not sooner as it's very likely the same issue as you experience

Comment by An_yMiner [ 31/Mar/16 ]

@sethbling's video: In order for a block to be able to be pushed the ones in front need to moved or destroyed. So when the piston extention gets pulled back, the piston base gets removed; Entities inside the extention are set infront of it. No surprise here.

What I'm complaining about is the behaviour of entities being moved into a position, where other blocks are:
Block started moving in tick t

  t <= -3 -3 < t < 0 t = -0 t = +0 0 < t < 3 3 <= t
Entity movement blocked y y n y n n
Comment by user-f2760 (Inactive) [ 31/Mar/16 ]

When retracting they do, see sethbling's video about it, this issue has been fixed, what you see is MC-89030

Comment by An_yMiner [ 31/Mar/16 ]

jirauser71590 MC-89030 moves entities out of blocks, not into them.

Comment by user-f2760 (Inactive) [ 30/Mar/16 ]

an_yminer actually what you see there is MC-89030

Comment by An_yMiner [ 30/Mar/16 ]

still in 1.9.2
https://youtu.be/LK6rZLBWRUg

Comment by An_yMiner [ 10/Mar/16 ]

It's still a problem for every block that moves before the mob takes notice. Mobs fall through retracting pistons; Mobs and players can be pushed into blocks that started moving earlier in the same tick.

Comment by [Mojang] Grum (Erik Broes) [ 16/Sep/15 ]

Things will not get pushed up when they get stuck in a block. They will prefer to fall down.

I think the current behaviour is at least predictable

Comment by [Mod] CubeTheThird [ 16/Sep/15 ]

I'm not entirely convinced that the remaining issue is actually a bug. Previously, if an entity is standing on a block, and a piston pushes it, it falls through the piston to the block below it. Now, instead of falling all the way through, it falls onto the "neck" portion, which is solid. Upon retracting the block, the player/entity is inside it, since the block is taller than the "neck", causing them to fall through. The same behaviour can be observed if the player stands on a slab, and is pushed by a full block.

Comment by user-f2760 (Inactive) [ 16/Sep/15 ]

I can also confirm for both plyer and skeleton (at least)

Comment by [Mod] CubeTheThird [ 16/Sep/15 ]

Can confirm for player, but not for mobs.

Comment by Manuel [ 16/Sep/15 ]

Still happening in 15w38a..

Comment by [Mojang] Grum (Erik Broes) [ 14/Sep/15 ]

This will be marked fixed in a snapshot near you soon.

Comment by KingSupernova [ 12/Sep/15 ]

Confirmed in 15w37a. Should be mentioned that it happens with any blocks being pushed by a piston, not just the arm.

Comment by Chris [ 20/Dec/14 ]

This also affects slime blocks moving with the piston head, when the piston is extending down or horizontally or retracting in any direction. But since it doesn't affect solid blocks, I'd say the problem isn't that we can fall through block 36, but that we can also fall through TileEntity

{id:"Piston", blockId: minecraft:piston_head}

and

{id:"Piston", blockId: minecraft:slime}
Comment by DOMOHEAD [ 18/Oct/14 ]

This is because you can fall through block 36

Comment by George Gates [ 18/Oct/14 ]

Confirmed in 1.8.1-pre2.
http://gfycat.com/TatteredDeliciousDegu

Comment by Joe Person [ 31/Mar/14 ]

Confirmed 1.7.5 with my accidental duplicate https://bugs.mojang.com/browse/MC-52281

Comment by fienxjox [ 23/Jan/14 ]

Continued confirmation, 14w04a

Comment by fienxjox [ 29/Oct/13 ]

Don't know about 1.6.4, but I can confirm 1.7.2 / launcher 1.2.8

Comment by Indigo [ 31/Oct/12 ]

I tested your modification and it seems you only fixed mobs going through blocks. The main problem was having things fall through the wooden retracting/extending piston part.

Comment by DiEvAl [ 30/Oct/12 ]

Yes, I don't work for Mojang. Mojangsta have "[Mojang]" in front of their name.

I think it will be fixed eventually. It may take some time for mojang to see this bug though.

Comment by Indigo [ 30/Oct/12 ]

@DiEvAl So you don't work for Mojang and just made a mod? Is this actually going to get fixed?

Comment by DiEvAl [ 30/Oct/12 ]

Fixed. [www.minecraftforum.net/topic/1543986-dievals-bugfixes-for-mojira/]

Comment by DiEvAl [ 29/Oct/12 ]

I think I fixed this bug. I'll post the fix today in the morning (it's 1:40 AM now)

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