Invisible armour stands make blocks with special renderers behind them invisible in spectator mode on Fast and Fancy graphics

Armour stands that are in front of chests and shulker boxes that are invisible will cause the chest to go invisible if the player is i spectator mode.

How to reproduce:

Summon an armour stand infront of a chest ( /summon minecraft:armor_stand ~ ~ ~ {Invisible:1b} )

Go into spectator mode