There is a band that renders slightly before the rest of the screen and moves about depending on the angle of the camera.
When not in full screen mode the position of the band seems to stay the same regardless of the position of the window, so if I drag the Minecraft window to the top of the screen I can't see the flickering.
Seems to have been there since 1.14.3 pre 2
I tried to record it using a screen recorder but this actually fixed the issue until I stopped recording. At 00:13 you can kind of see it but it's much more obvious in game.
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violine1101
That looks like an issue with your monitor to me, especially since it doesn't occur when using a screen recorder.
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When I was using the screen recorder the flickering stopped on the monitor and not just on the recording though. It's fine on 1.14.3 pre 1 and earlier
violine1101
Turns out I was wrong; this seems to be an issue that Mac users have since 1.14.3-pre2. Someone else already has reported the issue earlier: MC-154271