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  1. Minecraft: Java Edition
  2. MC-166879

Incomplete nether portal at y=254 in some cases

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    • Icon: Bug Bug
    • Resolution: Cannot Reproduce
    • None
    • 1.14.4, 1.15 Pre-release 3, 1.15.1, 1.15.2 Pre-Release 1, 1.15.2, 20w06a
    • None
    • Confirmed
    • (Unassigned)

      The bug

      Nether portals always spawn on the highest possible block but this can cause incomplete nether portals. When there is water below and a layer of blocks at y=254, an incomplete portal (as seen in this screenshot.) will generate at y=254 when there is plenty of room to spawn a complete portal below the layer. When the layer is removed, it does spawn a complete portal.

      How to reproduce

      1. Use this preset
        100*minecraft:water,154*minecraft:air,minecraft:grass_block;minecraft:ocean
        
      2. Go to the nether (/execute in minecraft:the_nether run teleport @s 0 100 0)
      3. Set a nether portal (/setblock ~ ~ ~ minecraft:nether_portal) and go through it
        Incomplete portal is generated despite having room below to spawn in the air

        1. unknowns.png
          unknowns.png
          37 kB
        2. unknown.png
          unknown.png
          87 kB

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              Created:
              Updated:
              Resolved:
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