In the wide and distant flat supercifies like the sea or flat worlds, black lines are seen in the background, like shadow rugs, it is more visible especially in the sea, since the water is not a whole block
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Thank you for your report!
We're actually already tracking this issue at MCPE-56838, so I will resolve and link this ticket as a duplicate.
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I noticed something similar last night on my husband's Xbox One. He was at the ocean, and the water on the horizon had a bunch of jagged blue streaks going through it. He was on my realm, and Chroma Hills pack is loaded to it.