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When the guardian is targeting someone, if the guardian is far enough out of your view the beam will not render.
There will still be bubbles around where the beam should be, but the beam is invisible and only renders again if you can see the guardian again.
It also means that for custom map making you can't have super long beams, instead you need to stack multiple guardians just to get a beam that looks infinite.
Note: The reason why the air bubbles are still visible but the beam not is because the bubbles are created by the method net.minecraft.entity.monster.EntityGuardian.onLivingUpdate() whereas the beam is rendered by the entity renderer.
- Summon a guardian which is unable to move
- Switch to Survival or Adventure mode
- Switch to third person view (F5)
- Stay near the guardian but rotate the camera in a way that the guardian is not visible anymore
→ You will see the air bubbles but not the beam
Note: For some angles the guardian is not visible but the beam is, therefor try rotating the camera a little bit more