Beacon beam twitches when it is not spinning (when looking at it from a distance)

Steps to reproduce this issue:

1. Enter a world.

2. Place iron blocks 3x3 on ground and place a beacon on it.

3. Move away and watch the beam from a distance.

4. Then try to watch it while moving, ideally from a diagonal position.

Expected result:

The beam would not twitch.

Actual result:

The beam twitches both while the player is and is not moving in two different ways.

Note:

I have enabled Vsync while recording this issue.