Screenshot taken during daytime is from 1.15, other two from 1.16
Blocks close by appear normal when on ground level, but at a distance or when above, blocks will appear black or transparent. Sometimes there are visible grid lines behind or under the invisible blocks. Usually happens between loading into a world and around two minutes into gameplay.
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-186601, which is a report that has not been resolved yet.
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Please provide a screenshot of this occurring with your F3 debug screen enabled.