Taking damage from a pointed dripstone while wearing a helmet makes the helmet invisible

Summary:
Taking damage from a pointed dripstone while wearing a helmet makes the helmet invisible. Also, the game will crash when you try to move the helmet using the shift-click.

Steps to reproduce:

1. Put helmet.

2. Place the pointed dripstone so it can fall on you.

3. Break the prop so the pointed dripstone falls on you.

4. Remove the helmet with a shift and click.

Observed results:
The helmet became invisible and when you try to move it, the game crashes.

Expected results:
The helmet will not become invisible and the game will not crash.

Video: