Triangular shadows randomly appear in the ocean.
Usually easily found in deep warm oceans.
Place light source blocks under the water to eliminate them.
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duplicates
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Thank you for your report!
We're tracking this issue in MC-166123, so this ticket is being resolved and linked as a duplicate.
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@@unknown, these two issues are different, MC-237607 only affects the ocean.

MC-226393 was resolved as a dupe as that report which is the same as this one albeit a little less subtle then yours
Sorry for my bad, they are actually the same issue.
I checked some duplicate issues.