Chunk visual glitch

Please attach a screenshot of this occurring while the F3 debug screen is enabled.

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Also please tell us what your graphics settings are, and if possible, a world download.

added SS of f3 right after it happened again.

Try with Chunk Builder: Fully blocking. This looks exactly like a rare visual glitch which can happen with Threaded.
If the glitch stops happening, then it's not a bug. It is a tradeoff between glitchless rendering and performance.