I've encountered this light bug at the edges of chunks several times in the water.In the case of the screenshot, I'm in an ocean monument, but the other time (I don't have the screenshot, unfortunately) I was in a coral reef and the light was coming from a sea cucumber, which, in fact, was interrupted precisely at the edges of the chunks.
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Hi there!
Could you please answer a few questions regarding this issue?
Does this issue still occur on the newest version of the game?
Could you list all the add-ons you are using?
Can you record and upload a video of this issue?
Could you upload a screenshot of your video settings?
This ticket will automatically reopen when you reply.
Yeah, they call it “light update“.
As the normal blocks, light can bug out and require a block update to make it “spread“ around.
That's a very old bug and it might have already been reported.