skeleton heads won't show when using the patchouli vizualization tool

discovered it when trying to summon the djinn familiar parrot(purple one)

the heads not showing up

book

System (please complete the following information):

• Occultism Version: version 1.0.3 for 1.16.4
• OS: [e.g. Windows] windows 10
• Minecraft Version: 1.16.4
• Modpack Link and Version, or list of mods:
• here is a dropbox link
• https://www.dropbox.com/sh/kb3q32kecjr7dpm/AAD6BqFo-qjrAJ02nWnaZWVua?dl=0

This is a patchouli (the mod that enables the in game guide and block previews) issue, that in turn seems to be due to some vanilla rendering weirdness - sadly it seems they cannot fix it currently.

ok still better to report just to be sure