Load up seed -709494128138866206 in 1.17 at let the chunks load up at spawn. Open up the world in 21W44A, there is a mineshaft directly below the immediate chunks. It appears twice, once above Y= 0 and again below 0
/execute in minecraft:overworld run tp @s 159.94 19.05 390.78 -141.76 13.20
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The layouts are identical, the difference appear to be simply down to the fact the lower one has some of the new blocks and has part of it in the new dripstone cave and it's shifted by a few blocks.
I think the screenshots below arethe best way to demonstrate it. Both taken looking in exactly the same direction. I've put the commands below the pictures so you can see it easier. Both have have 4 tunnels facing towards you,
The bottom left tunnel on both has the cave spider spawner. The bottom right tunnels both have the "steps" coming down towards you, although the lower one has tuft.
The top two tunnels if you look at the block patterns on the ceiling (the blocks that stick out) they are identical. The third command should show you what I mean, the only difference is that 4 of the blocks in the pattern on the top tunnel are dirt.
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/execute in minecraft:overworld run tp @s 215.16 34.07 397.59 -178.06 0.15
/execute in minecraft:overworld run tp @s 215.16 -35.30 397.59 -178.06 0.15
/execute in minecraft:overworld run tp @s 210.61 -39.78 357.07 -181.81 -90.00 (shows the block pattern in the left tunnels ceilings)
/execute in minecraft:overworld run tp @s 226.91 -40.15 369.30 -181.66 -90.00 (shows the block pattern in the right tunnels ceilings)
What precisely is the issue here? Are you claiming that the mineshafts are identical? When I tested this I saw a mineshaft with the new generation under a mineshaft with the old generation.
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