Items always pass through walls (and even full blocks) when pushed for example by pistons.
Watch the video to understand clearly the problem here.
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[Mojang] Mega_Spud (Jay)
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@unknown You're right. It depends on the direction of the piston.
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I'm pretty sure this
Works as Intended
If it doesn't, and they patch this, it will break a whole lot of stuff, because some buildings are hardwired to take advantage of this.
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@unknown No. It is a bug. It happens with all items and even if I place a shulker box next to the piston, the piston will break the shulker box and the shulker box will pass through the wall and fall. This is 100% an issue. It doesn't happen in Java/consoles and from a simple understandable point of view, it's easy to understand that this is a problem. Why items should pass through walls? and which buildings are harwired to take advantage of this behaviour?
[Mojang] Mega_Spud (Jay)
Thank you for your report!
We're going to be tracking this issue at MCPE-46746, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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This does seem to vary depending on the direction the piston arm is facing.