This is best seen when outside of the world border and at a corner. When in the demonstrated position, a section of the world border that extends into solid block territory and is usually not visible as a result ends up being visible.
Linked issues
Attachments
Comments 6
Thank you for your report!
We're resolving and linking this ticket forward as a Duplicate of MC-311265, as that ticket contains more detailed information and/or has already been triaged by Mojang.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
Can confirm that this is an issue. Also affects 1.16.5 along with 1.17 Release Candidate 1.