When placing a sea lantern. The top part of the block does not seem to emit any light while all other sides emit light normally.
This can be fixed by placing some other light source near or on the Sea lantern
While a small bug, it does effect general gameplay.
Thank you for your report!
We're actually already tracking this issue at MCPE-58182, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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