Shotadft

Confirmed in 1.21.10
This might not be necessary, but I'll post the SNBT with this bug fixed here anyway.

{
  size: [
    4,
    3,
    4
  ],
  entities: [],
  blocks: [
    {
      pos: [
        0,
        0,
        0
      ],
      state: 0
    },
    {
      pos: [
        0,
        0,
        1
      ],
      state: 0
    },
    {
      pos: [
        0,
        0,
        2
      ],
      state: 0
    },
    {
      pos: [
        0,
        0,
        3
      ],
      state: 0
    },
    {
      pos: [
        1,
        0,
        0
      ],
      state: 0
    },
    {
      pos: [
        1,
        0,
        1
      ],
      state: 0
    },
    {
      pos: [
        1,
        0,
        2
      ],
      state: 0
    },
    {
      pos: [
        1,
        0,
        3
      ],
      state: 0
    },
    {
      pos: [
        2,
        0,
        0
      ],
      state: 0
    },
    {
      pos: [
        2,
        0,
        1
      ],
      state: 0
    },
    {
      pos: [
        2,
        0,
        2
      ],
      state: 0
    },
    {
      pos: [
        2,
        0,
        3
      ],
      state: 0
    },
    {
      pos: [
        3,
        0,
        0
      ],
      state: 0
    },
    {
      pos: [
        3,
        0,
        1
      ],
      state: 0
    },
    {
      pos: [
        3,
        0,
        2
      ],
      state: 0
    },
    {
      pos: [
        3,
        0,
        3
      ],
      state: 0
    },
    {
      pos: [
        0,
        1,
        0
      ],
      state: 0
    },
    {
      pos: [
        0,
        1,
        1
      ],
      state: 0
    },
    {
      pos: [
        0,
        1,
        2
      ],
      state: 0
    },
    {
      pos: [
        0,
        1,
        3
      ],
      state: 0
    },
    {
      pos: [
        1,
        1,
        0
      ],
      state: 0
    },
    {
      pos: [
        1,
        1,
        3
      ],
      state: 0
    },
    {
      pos: [
        2,
        1,
        0
      ],
      state: 0
    },
    {
      pos: [
        2,
        1,
        3
      ],
      state: 0
    },
    {
      pos: [
        3,
        1,
        0
      ],
      state: 0
    },
    {
      pos: [
        3,
        1,
        1
      ],
      state: 0
    },
    {
      pos: [
        3,
        1,
        2
      ],
      state: 0
    },
    {
      pos: [
        3,
        1,
        3
      ],
      state: 0
    },
    {
      pos: [
        0,
        2,
        0
      ],
      state: 0
    },
    {
      pos: [
        0,
        2,
        1
      ],
      state: 0
    },
    {
      pos: [
        0,
        2,
        2
      ],
      state: 0
    },
    {
      pos: [
        0,
        2,
        3
      ],
      state: 0
    },
    {
      pos: [
        1,
        2,
        0
      ],
      state: 0
    },
    {
      pos: [
        1,
        2,
        3
      ],
      state: 0
    },
    {
      pos: [
        2,
        2,
        0
      ],
      state: 0
    },
    {
      pos: [
        2,
        2,
        3
      ],
      state: 0
    },
    {
      pos: [
        3,
        2,
        1
      ],
      state: 0
    },
    {
      pos: [
        3,
        2,
        2
      ],
      state: 0
    },
    {
      pos: [
        3,
        2,
        3
      ],
      state: 0
    },
    {
      pos: [
        1,
        1,
        1
      ],
      state: 1
    },
    {
      pos: [
        1,
        1,
        2
      ],
      state: 1
    },
    {
      pos: [
        2,
        1,
        1
      ],
      state: 1
    },
    {
      pos: [
        2,
        1,
        2
      ],
      state: 1
    },
    {
      pos: [
        1,
        2,
        1
      ],
      state: 1
    },
    {
      pos: [
        1,
        2,
        2
      ],
      state: 1
    },
    {
      pos: [
        2,
        2,
        1
      ],
      state: 1
    },
    {
      pos: [
        2,
        2,
        2
      ],
      state: 1
    },
    {
      nbt: {
        joint: "aligned",
        name: "minecraft:bottom",
        pool: "minecraft:village/common/well_bottoms",
        final_state: "minecraft:cobblestone",
        placement_priority: 0,
        selection_priority: 0,
        id: "minecraft:jigsaw",
        target: "minecraft:bottom"
      },
      pos: [
        3,
        2,
        0
      ],
      state: 2
    }
  ],
  palette: [
    {
      Name: "minecraft:cobblestone"
    },
    {
      Properties: {
        level: "0"
      },
      Name: "minecraft:water"
    },
    {
      Properties: {
        orientation: "up_north"
      },
      Name: "minecraft:jigsaw"
    }
  ],
  DataVersion: 3955
}