Bug: prop_testchamber_sign doesn't render through refracting materials

[lenship2]

Describe the bug

When using a refracting material in a map, any prop_testchamber_sign will not render behind the refracting material unless the entity origin is also being rendered behind it.

Issue Map

Any map

To Reproduce

1. Use a small refracting material that allows you to see around its frame in game
2. Place a prop_testchamber_sign behind it
3. Look at the prop_testchamber sign in-game from multiple angles, and observe it failing to render.

Operating System

No response