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  1. Minecraft: Java Edition
  2. MC-172980

Block light updates don't cross chunk borders properly when updated

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    • Icon: Bug Bug
    • Resolution: Fixed
    • 20w22a, 23w17a
    • 20w08a, 20w12a, 20w15a, 20w17a, 20w19a, 1.16 Pre-release 2, 1.16.2 Release Candidate 2, 1.16.2, 1.16.3, 1.16.4 Release Candidate 1, 1.16.4, 20w45a, 20w48a, 20w51a, 21w03a, 21w05b, 21w06a, 21w19a, 1.17 Release Candidate 2, 1.17, 1.17.1 Pre-release 1, 1.17.1 Pre-release 3, 1.17.1 Release Candidate 1, 1.17.1 Release Candidate 2, 1.17.1, 21w40a, 21w41a, 21w42a, 21w43a, 21w44a, 1.18 Pre-release 1, 1.18 Pre-release 5, 1.18 Release Candidate 1, 1.18, 1.18.1, 1.18.2 Pre-release 1, 1.18.2, 22w12a, 22w13a, 22w14a, 22w16b, 22w17a, 22w18a, 22w19a, 1.19 Pre-release 3, 1.19, 1.19.1 Pre-release 4, 1.19.1 Pre-release 6, 1.19.1 Release Candidate 2, 1.19.1, 1.19.2, 22w43a, 1.19.3 Pre-release 2, 1.19.3, 23w03a, 1.19.4, 23w13a
    • None
    • Confirmed
    • Lighting
    • Important

      The bug

      Block light updates don't cross chunk borders properly when updated. This can be caused by fire placed by exploding beds, using /fill to fill a large amount of light sources or other blocks, using /place to place a feature or structure with light sources, or other miscellaneous circumstances. This may also occur upon world generation with light sources, see MC-249508.

      To reproduce

      1. Create a new flatland world
      2. /time set midnight
      3. Run 
        /fill ~ ~ ~ ~63 ~ ~63 sea_lantern

        while on the ground

      4. Enable chunk border overlay (F3+G)
        → The light will not have updated properly in some places
      5. Replace the sea lanterns with air again 
        /fill ~ ~ ~ ~63 ~ ~63 sea_lantern

        → The light did not update properly again

      Video

      https://youtu.be/lbIkC16GHYQ

      Original description

      i was building a house and then all of a sudden i noticed that one half of the house was bright and lit while the other was mostly dark with light patches.

      in the photo you can see the split. in the video i switch between the light block and dark block and they have the same light level even though they visually are different.

      i had no lanterns before this and the same thing happened.

      i tried updating the blocks around and it worked but then returned when i updated other areas.

      you can see in the second video that it will just flicker when i try and update the blocks.

      the other 2 screenshots are just other odd things that the lighting caused.

      you should also know that i placed most of the roof with the /fill command if that helps

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            Unassigned Unassigned
            galaxion4 solartron3000
            Votes:
            40 Vote for this issue
            Watchers:
            25 Start watching this issue

              Created:
              Updated:
              Resolved:
              CHK: