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  1. Minecraft: Java Edition
  2. MC-3961

Water, Cobwebs, Magma, Leaves and other blocks save sunlight


    • Icon: Bug Bug
    • Resolution: Fixed
    • Minecraft 18w43a
    • Minecraft 1.4.5, Minecraft 1.4.7, Snapshot 13w05b, Minecraft 1.5, Snapshot 13w11a, Minecraft 1.7.5, Minecraft 14w11b, Minecraft 14w21b, Minecraft 1.7.10, Minecraft 14w28a, Minecraft 14w28b, Minecraft 1.8, Minecraft 1.8.1-pre3, Minecraft 1.8.1, Minecraft 1.8.2-pre6, Minecraft 15w38b, Minecraft 15w47c, Minecraft 1.9 Pre-Release 1, Minecraft 1.10, Minecraft 1.10.2, Minecraft 16w32a, Minecraft 16w32b, Minecraft 16w33a, Minecraft 16w35a, Minecraft 16w44a, Minecraft 1.11.2, Minecraft 17w06a, Minecraft 17w13a, Minecraft 17w13b, Minecraft 17w14a, Minecraft 17w15a, Minecraft 17w16a, Minecraft 17w17b, Minecraft 17w18a, Minecraft 17w18b, Minecraft 1.12 Pre-Release 1, Minecraft 1.12 Pre-Release 2, Minecraft 1.12 Pre-Release 3, Minecraft 1.12 Pre-Release 4, Minecraft 1.12 Pre-Release 5, Minecraft 1.12 Pre-Release 6, Minecraft 1.12 Pre-Release 7, Minecraft 1.12, Minecraft 17w31a, Minecraft 1.12.1 Pre-Release 1, Minecraft 1.12.1, Minecraft 1.12.2 Pre-Release 1, Minecraft 1.12.2 Pre-Release 2, Minecraft 1.12.2, Minecraft 17w43a, Minecraft 17w43b, Minecraft 17w45a, Minecraft 17w48a, Minecraft 17w50a, Minecraft 18w01a, Minecraft 18w03b, Minecraft 18w06a, Minecraft 18w09a, Minecraft 18w16a, Minecraft 1.13-pre1, Minecraft 1.13-pre3, Minecraft 1.13-pre10, Minecraft 1.13, Minecraft 18w30b, Minecraft 18w31a, Minecraft 1.13.1
    • Confirmed


      This issue is about sunlight. For the related block light issue, see MC-102162.

      The bug

      Certain blocks "save" sunlight, emiting it even after the original source has been removed. This creates an annoying glowing spot and is very difficult to clean up given that the blocks are not obviously the source of the glowing (and that it can chain between multiple of them).

      Affected blocks (may be incomplete)

      • Water
      • Leaves
      • Cobweb
      • Magma
      • Lit redstone ore
      • Lit furnace
      • Powered redstone lamp
      • Glowstone
      • Sea lantern
      • Jack-o-lantern


      1. Build a sealed room without any lights in it with a single layer between it and the sky.
      2. Place one of the effected blocks on the floor.
      3. Break the ceiling block above that block.
      4. Replace the ceiling block.
      5. Observe that the room remains lit, despite the lack of a light source.


      • In versions prior to 1.7.2ish, this also affected other blocks (for sure glowstone, lit redstone ore, lit furnaces, and jack 'o lanterns — mostly, blocks that exhibit MC-102162 but also similar blocks that emit full light). In 1.7.2 it was fixed for those blocks. Incidentally, 1.7.2 had a fix that removed an x-ray effect when inside of glowstone; it's possible that those are related. this issue returned for 1.11.2
      • Lava is not effected, despite also being a fluid.
      • Water only finicky about being affected; if it's in a pit it doesn't get affected but if it's above the ground it is.
      • This only happens when the block is in direct sunlight; if it's next to the sunlight but not exposed to the sun it doesn't seem to happen.


      Demonstration from the Minecraft version 1.4.5 : http://youtu.be/8nTd1KbbrLA

      EDIT SEPT 19 2015: Demonstration from the Minecraft version 15w38b: https://youtu.be/bPUdssOvU78

            fry [Mojang] Georgii Gavrichev
            min666645 Hinata
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