In the BTU change log (https://minecraft.gamepedia.com/Bedrock_Edition_1.2#Items_2) it is listed that items will now go up a 3x3 glass item elevator as in other versions, however when this is attempted both on (1.2) XB1 and Win 10 with a design that works in 1.12 and TU57, the items escape into the hopper beside them (depicted in the YouTube link below) or onto the floor when no hopper is present (not depicted in video). This function was intended to work as it has been added in updates to several platforms and listed in changelogs as intended. It also does not work on mobile devices.
It also seems, as shown in the video that if the items are allowed to cycle from the dropper, into the hopper, and back in the hopper with such speed, items are deleted. (I started the demonstration with 64 pistons and ended up with 38, no items reached the top hoppers.)
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The wiki information was not from the official changelog. It came from a redditor who had asked Helen Angel about 3x3 item elevators, and she answered that they "should work now". In fact, they didn't work and don't work now: What actually happens is that items embedded in a transparent block will be pushed upward if there is air above the block but otherwise will just bounce up and down within the transparent block. The official changelog says "Items will now be pushed when a transparent block is placed over them" [emphasis added] but that doesn't necessarily mean they'll be pushed all the way to the top, and it says nothing about items dispensed into a transparent block. So the basic assumption here that 3x3 glass item elevators should work is possibly incorrect. I have asked HelenAngel to find out so I can fix the wiki if it is wrong, and will report what I hear back from her.
The wiki information was not from the official changelog. It came from a redditor who had asked Helen Angel about 3x3 item elevators, and she answered that they "should work now". In fact, they didn't work and don't work now: What actually happens is that items embedded in a transparent block will be pushed upward if there is air above the block but otherwise will just bounce up and down within the transparent block. The official changelog says "Items will now be pushed when a transparent block is placed over them" [emphasis added] but that doesn't necessarily mean they'll be pushed all the way to the top, and it says nothing about items dispensed into a transparent block. So the basic assumption here that 3x3 glass item elevators should work is possibly incorrect. I have asked HelenAngel to find out so I can fix the wiki if it is wrong, and will report what I hear back from her.
The wiki information was not from the official changelog. It came from a redditor who had asked Helen Angel about 3x3 item elevators, and she answered that they "should work now". In fact, they didn't work and don't work now: What actually happens is that items embedded in a transparent block will be pushed upward if there is air above the block but otherwise will just bounce up and down within the transparent block. The official changelog says "Items will now be pushed when a transparent block is placed over them" [emphasis added] but that doesn't necessarily mean they'll be pushed all the way to the top, and it says nothing about items dispensed into a transparent block. So the basic assumption here that 3x3 glass item elevators should work is possibly incorrect. I have asked HelenAngel to find out so I can fix the wiki if it is wrong, and will report what I hear back from her.
Okay, good to know. Do you suppose I should put this in the ideas forum? I think it really needs to be implemented into the game. Typical dropper elevators are laggy and sometimes noisy.
For completeness, I heard back from Helen Angel (see my comment above). She answered: "It should go to the first available space where it can exist whether up or sideways. So we believed we fixed it and that glass elevators should work but it looks like we didn't and it's still a bug?"
The wiki information was not from the official changelog. It came from a redditor who had asked Helen Angel about 3x3 item elevators, and she answered that they "should work now". In fact, they didn't work and don't work now: What actually happens is that items embedded in a transparent block will be pushed upward if there is air above the block but otherwise will just bounce up and down within the transparent block. The official changelog says "Items will now be pushed when a transparent block is placed over them" [emphasis added] but that doesn't necessarily mean they'll be pushed all the way to the top, and it says nothing about items dispensed into a transparent block. So the basic assumption here that 3x3 glass item elevators should work is possibly incorrect. I have asked HelenAngel to find out so I can fix the wiki if it is wrong, and will report what I hear back from her.