/damage can damage end crystals even though the chat says it cannot

The /damage command can apply on end crystals although the client says “cannot apply damage on ender crystal“.

Steps to Reproduce:

1. Place an end crystal

2. Type /damage @e[type=ender_crystal] 1 in the chat

Observed Results:

The chat says “Could not apply damage to Ender Crystal”, but the end crystal is destroyed anyway.

Expected Results:

The end crystal should not be destroyed, or the chat should not say it could not apply damage to the end crystal.