Invisible red/brown mooshrooms do not render top mushrooms at all under certain circumstances

(This issue is not exclusive to the 1.20.5 development cycle, and occurs in 1.20.4)
Invisible red or brown mooshrooms do not render their top mushrooms when viewed in spectator mode, or when they are on the same team as the player.

Steps to Reproduce:

1. Spawn a mooshroom

2. Make it invisible
   

   /effect give @e minecraft:invisibility infinite

3. Change gamemode to spectator

Observed Behavior:

The red or brown mushrooms on top of the mooshroom will not be visible at all.

Expected Result:

The red or brown mushrooms would be visible at all times, regardless of the entity's effects, or the gamemode the player is in.

Screenshots/Videos:

Notes:

Related to other invisible entity rendering issues such as;

(will add after other issues are created)