Below is a list of five issues and one suggestion regarding MOB rendering that can be observed in version 2.0.1.

[Issues]

1. When a MOB is in the Irradiated state, applying Invisibility still reflects the Irradiated state shader. It is not appropriate that the Irradiated state cannot hide its appearance.
   

2. The following entities do not render certain blocks:

• Forsaken in the Invisibility state
• Bubbles (the same applies to bubbles from other MOBs and players)
  
  
  

3. Gummy Bear does not render correctly in certain states:

• The Irradiated state shader is not reflected.
• When both Invisibility and Glowing are applied, the Glowing effect is not reflected.

4. The following MOBs do not receive the effects of Invisibility:

• Ferrouslime
• Watcher

5. The following MOBs do not render correctly when in the Invisibility state.
   *There were others as well, but I couldn't determine which ones are intentional.

• Nucleeper
• Brainiac
• Ray Cat
• Notor (propeller part)
  

[Suggestion]
I believe the following MOBs should not receive status effects, similar to the Ender Dragon or Wither. In particular, I don't think the effect of Invisibility is suitable for hiding their massive size:

• Luxtructosaurus
• Atlatitan
• Tremorzilla
• Hullbreaker