The bug
Invisible spiders are special in that their eyes are still visible and glow. However, if they are in front of a sign, the sign will clip through the eyes, making them invisible. Happens to dyed signs, signs of any type, regular spiders, and cave spiders.
Affected Blocks
Signs
Beds
Chests
Shulker Boxes
Mob heads/skulls
List may be incomplete
How to reproduce
Place a sign
Summon a spider next to the sign, using the following command:
/summon minecraft:spider ~ ~ ~ {NoAI:1b}
Splash the spider with invisibility
→ ❌ The spider's eyes render behind the sign
Linked issues
relates to 1
Attachments
Comments 11

Can confirm in 1.18.1 and 22w06a. This issue isn't exclusive to signs and can also be seen with other blocks that are specially rendered such as beds, chests, shulker boxes, mob skulls, etc...