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Java Edition:Invalid Light Levels

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This article is a work in progress. 
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Throughout many versions of Minecraft, it was possible to get invalid light levels in your world. An example of this would be a dark spot in your world in pure daylight with nothing to make that spot dark.


Obtaining

Light Suppression

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This article is a work in progress. 
Please help in the creation of this article by expanding or improving it.
To do: We need someone who knows how light suppression works. (https://bugs.mojang.com/browse/MC-249181)

Jukebox Crash

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To do: What light level is decreased to is unknown, and there is no bug report to cite.
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Warning: Game Crash 
This feature can crash your game, perform at your own risk.

In both versions of 13w05a (the Pre-Reupload and the Post-Reupload), when breaking a jukebox containing a music disc would crash the game. When rejoining the world, there would be a dark spot under the jukebox.

Bright Waterlogged Blocks

From 18w07b to 1.13 Prerelease 6, waterlogged blocks would not decrease the light level like normal water block do[1].

Broken Shulker Box

From 1.20.2 to 24w10a, breaking a shulker box as it was closing would keep a dark spot on the ground as a light level of 14[2].