While standing next to a solid structure above head height, looking down, one can jump and place a block underneath your feet. When doing so, an additional block is placed atop the surface of the adjacent structure.
Initially I thought this was duplicating the block, but closer testing revealed it is taking the block from inventory.
The screenshots below demonstrate. I am standing in an empty space in shot 1. Shot 2 I create a stack of 3 blocks. Shot 3, I stand adjacent to the stack of 3, looking down. Shot 4, I have jumped and placed a block, while looking down. Shot 5, I stand back from the pillar and see an additional block was placed atop that pillar, even though I only attempted to place one underneath me.
I tested this in creative mode and was able to reproduce it with an adjacent stack 4 and 5 blocks high, though it seemed harder to reliably reproduce. It seems to require a specific cursor placement at the base of the adjacent blocks.
Here is a video of this behavior: https://youtu.be/sQM20ZcgWMY
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I've had the same thing happen when placing wooden columns at the corner of a house. I jumped up to place blocks directly underneath me, to a height of four blocks, then moved to the next corner to do the same. There was a glitch on placing the first block, and when I finished, I looked back at the previous corner to find that it was at a height of FIVE blocks.
It took several times of this happening before I realized that the first block I placed on the new column was being put on the previous column over 6 blocks away.
1.2.6. My sense of it is, from the LAST place you jump-placed a block, when you start as second stack, it will take the next block you intend to place from your inventory and place it on top of that last place you jump-placed a block, then fill where you intended. This seems to work from a reasonable distance, though I've not tried to test explicitly how far this works. But even if you place, say a wall or torch normally, the very next time you "jump-place", that first block will go on top of the fence or over the torch AND another block where you intend. No block duping ever seems to happen, but this is really annoying as hell when doing some jump-placement work.
Oh, this happens both single-player, LAN, and in Realms.
I agree - I have confirmed that adjacency isn't a factor here. I was building a large structure and found glitch-placed blocks rather far from the area that I am currently working in. I also agree that it is incredibly annoying, FWIW.
I have experienced this same issue. The only exception being that sometimes it will place a block (eye-level if available) 4-5 blocks away. This happens with solid blocks and blocks like staircases.