HUD Opacity is broken with some 3D objects and text

Some time ago, I noticed how with HUD opacity being low some 3D objects that have separate polygons are rendered incorrectly. (Also happens with bold text, XP bar borders and numbers, heart icons and selected hotbar slots)

Steps to Reproduce:

1. Set your HUD opacity to something a little bit transparent (like 50% or 35%)

2. Get stairs, a dragon head or something with extra polygons. / Do "/title @s title §lTest 1234".

Observed Results:
You can see some normally invisible parts of the object/text.

Expected Results:
You can only see the usually visible parts of the object/text.