[MC-67641] Using setblock or fill on a piston head leaves an item drop

When using setblock on the piston extension of an extended piston, a piston item is dropped.

This also happens when using the fill command when pistons are facing certain ways(due to the nature of the fill command using multiple setblock commands)
When using a fill command, if an extended piston facing either north, west or down is present in the area, it will drop a piston item.

How to recreate the problem:

Place a command block with the command
```
fill ~1 ~ ~1 ~5 ~ ~5 air
```
Place a piston in the area to be filled facing either north or west.
Place a redstone block next to the piston, making it extended.
Place a redstone block next to the command block.
❌ A piston item will now drop.

Linked issues

is duplicated by 4

MC-119402 Clone command drops lots of pistons Resolved

MC-190137 /clone ... replace move - 1 Pistons Resolved

MC-197385 Use setblock to remove a piston head causes the piston to drop, rather than removing the piston or making it headless Resolved

MC-231828 Replacing the piston arm using /setblock causes the piston to break (and drop) Resolved

relates to 1

MC-149 Powered pistons drop as items in creative Resolved

Attachments

MC-67641.mp4

Comments 22

qmagnet 2014-08-16T00:47:30Z

Command used?

Nasm Nasmus 2014-08-16T00:56:03Z

Added the command to be used and a way to recreate it completely.

qmagnet 2014-08-16T02:51:31Z

Looks like MC-149 has returned.
The bug happens when you setblock on a piston extension. Although it happens in and gamemode (not just creative)

qmagnet 2014-08-16T02:59:31Z

@Nasm, for now clarify your title and description. This has nothing to do with direction. The only reason fill does this from the north/west, is because the extension is getting destroyed before the piston block in that configuration.

The bug is:
using setblock or fill a piston extension leaves an item drop

A workaround for you, is to use a fill replace command, and just replace the sticky_piston with air

Nasm Nasmus 2014-08-16T11:19:14Z

Thank you, edited the title and description.

I did indeed use a second command block that replaces sticky_piston with air already.

12 more comments

qmagnet 2014-08-16T11:29:18Z

Man, my grammar is bad.
Better title would be:
using setblock or fill on a piston extension leaves an item drop

Nasm Nasmus 2014-08-16T11:40:26Z

Heh. I didn't even read it correctly, should be better now.

qmagnet 2014-08-16T11:45:49Z

For now, if you put tile drops on false, you can eliminate the piston items too.

Nasm Nasmus 2014-08-16T11:55:47Z

True, but that doesn't work for the use I have for it.

qmagnet 2014-08-16T12:09:50Z

What about flipping the gamerule on during the piston swap, then turning it off when it's done?

Nasm Nasmus 2014-08-16T12:17:36Z

In my specific case I want the command block to destroy itself and an area around it. I would need multiple extra command blocks to make it work. Filling the pistons with air before filling the rest with air only requires one extra command block.

Nasm Nasmus 2014-12-22T18:11:35Z

Still an issue in the current version, updated the ticket.

marcono1234 2015-07-03T18:45:56Z

Confirmed for

1.8.7 But I don't believe this is valid.

There are two main problems:

/fill does not operate in one tick or at least it allows block updates between placing the blocks. This is also the reason why you can't fill large areas with portals
You have the same with every "two-block" block like doors and beds for example. Breaking one side causes it to drop

Note: The summary is misleading as it is not the piston extension (technical block) but rather the piston head

kumasasa 2016-10-22T05:49:47Z

Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time.