When walking around a slime or honey block, the small inner block doesn't get rendered and it becomes visible again after a split second.
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It's because of the black lines that are shown when you are watching the block in front of you, I think.
violine1101
Thank you for your report!
We're actually already tracking this issue in MC-163098, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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