When a Guardian or Elder Guardian attacks, the beam of that mob is no longer rendered and only bubble particles can be seen. This is not the case in 20w30a and older versions.
How to reproduce
- Find or spawn a Guardian or Elder Guardian.
- Switch to Survival mode for the mob to attack the player.
→ The Guardian beam is invisible.
MC-165595 Guardian beam does not render when over a certain "Time" in level.dat