In the image, in the left corner you can see a blue chunk. It only appears when looking in a certain direction and goes away when I use F5 or look towards it. Building, reloading chunks and relogging does not fix the issue.
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Thank you for your report!
We're actually already tracking this issue in MC-63020, 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.