kelp drop transparency within 16 blocks, the behavior is unique to kelp only. not affecting seaweed, fancy leaf trees, and other transparent/translucent objects. this bug is associated with MCPE-32737 but was misidentified as work as intended. the lod pop-in/out behavior is extremely obtuse.
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Thank you for your report!
We're tracking this issue in MCPE-32737, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Sorry, but creating a new bug report is not a valid way to ask for a Works As Intended resolution to be reconsidered. You can make a feedback post on feedback.Minecraft.net, or see if there is already one existing.
The behavior you are seeing for kelp actually applies to a lot of blocks, for details see MCPE-124841 and MCPE-34794.