No light is emitted from the top of sea lantern
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No resource packs installed just default
Yes this is at Y=80
I put up some scaffolding and it is dark on the top too.
I think this is probably just a lighting glitch. There are some very old tickets that report this kind of thing, but it's rare and very hard to reproduce, so a proper fix is slow in coming.
On the other hand, they're easy to fix in a specific instance. All you have to do is place a light source in the affected subchunk. This causes the lighting to be recalculated, eliminating the problem.
Please try placing a light source on top of the darkened sea langern (or scaffolding, if that's what you have now). If that solves your problem, I'll try to identify one of the old tickets and make this one a duplicate report.
Yes, placing a sea lantern placed on top the dim lantern restores the light.
I can repeat the dim block fairly regularly by moving away enough to unload the chunk, then return and place a sea lantern at Y=80 again and it will be dim.
The lighting glitch seems to have reappeared with 1.13. I’ve listed a bunch of duplicates under MCPE-58182.
Y=63 to Y=64 is a sub chunk boundary, just like Y=79 to Y=80 as mentioned by Auldrick in the comment above. They are multiples of 16 like chunks but you start at 0, so Y=0 to15 is a sub chunk, and so on.
It does seem to be random which chunks/subchunks get affected, but it has something to do with when they get reloaded. Are you saying another player is always there so they are always loaded? If you can identify a pattern of chunks/subchunks that are affected each time you reload them (which is what I think you might be saying), that would probably be a helpful information for the devs. Can you upload a picture of the area?
Edit: the posts this comment was replying to were deleted by a dev, presumably for being inappropriate for the bug tracker. However, the picture referenced is still attached and provides an illustration of the issues discussed.
Could not reproduce on Windows 10. Is there anything different about the one sea lantern that would make it different from the others? It looks like its top might be at Y=80, which is a subchunk boundary. Are you using a chunk boundary revealer resource pack?