When viewing bodies of water with Vibrant Visuals, black glitches will appear. To reproduce, turn on Vibrant Visuals, max out view distance, and simply find an ocean and view it from far. It creates black glitches that will dissapear once you get near them. It should be expected to see the ocean clearly as it does with Fancy graphics which both images are attached. Instead, only with Vibrant Visuals, it just creates these weird render glitches that resemble artifacts yet its not hardware related (that I know of).
This issue is being tracked at MCPE-220439.