When there are waterlogged blocks from the sea floor to the surface, the bottom block creates a light, even if it isn't supposed to.
Just build a fence pole from the sea floor to the surface and light will produce from the bottom block.
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Attached video. I couldn't reproduce this in the latest beta though, can you confirm if it's still an issue?
I was gonna attach a video to it but it was too large (25/10 MB)