When a sticky piston is put on a 3 tick clock and positioned facing the block above a hopper, if the chunk unloads/loads at the right timing, it creates an invisible, unbreakable block that has a hitbox showing it halfway between 2 blocks (the 2 blocks that the sticky piston would push it between). I had the sticky piston pushing a piece of cobblestone, which has vanished and is replaced with the unremovable block. Note, i am able to put any block in front of the piston, however the piston will not extend given a charge (look at attached screenshots). I cannot place a block in the location that the piston would push another block into. In case you don't understand. In the screenshots, you can see the outline of an invisible block which we (its on a server) can't break. Of the 2 blocks it is on, you can place anything on the left, and cannot place anything on the right. You can walk through the block just fine. It should be important to note that there are two of these on top of one another (third picture shows the upper hitbox).
Edit 1: When it was created, there was a second hopper under what had been the block the cobblestone would be pushed on to. Again, cobble gone, new block there. I mined up the hopper (its in my hotbar) because i was trying to figure out whats wrong.
Edit 2: Thank you Matthew Hunter, right clicking it with an open hand did successfully make it go away, it only worked when we used an open hand. I will leave the issue open for now since this is still a bug, I had to reset a huge redstone system when block 36 got in the way.
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Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.
Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.
Just had this issue happen to me. Interestingly enough it was in a bedrock 1.20.73 realm and visible to all players. Could even place blocks inside it including chests that were still functional.
It happened in a replication of this bonemeal moss farm https://youtu.be/uvA9moY0tf8?si=rpnGJZ3xgEdsPiuJ in the centre of the machine where the moss blocks get squashed - not directly next to the piston.
Mathew's explanation of accidentally glitching out the chunks does still make sense for this case however, as the cause of this was (presumably) having an Xbox turn off while afking at the machine. The only possible fix was to right click/left trigger/L2 on each "block" with an empty hand.
However... Bit of a problem. That only fixes the issue client side. Meaning it just turns into an invisible version that reappears after you relog. On top of that, the interacting with the "block" with an empty hand fix no longer works. Pistons can push blocks into the "block" but once a block is inside it, that block becomes immovable in the direction that the "block" was originally being pushed. You also can't place anything on that side of the "block", so an offset hotbox makes sense.
Honestly don't care if it can be patched of not I just want a way to get rid of it so I don't have to rebuild the farm.
You just created block 36 or piston_extension! This is the block that a piston uses as a placeholder when it is in the middle of extending. You have somehow glitched out the chunks to keep block 36. I'm pretty sure you can right click on it to remove it I believe. It's not a bug and I don't think can be fixed with Minecraft's current chunk loading system. The hitbox is also weird. Any block in Minecraft can't be in between two blocks. The block 36 is one block, but its hitbox is offset by half a block.