Exploding an End Crystal doesn't produce explosion vibration

Steps to Reproduce:

1. Place a Sculk Sensor on the ground;
2. Use a comparator to get the correct vibration type;
3. Place a line of redstone dust to observe the signal strength;
4. Place an End Crystal nearby;
5. Surround it with obsidian to avoid messing up the redstone;
6. Punch the crystal.

Observed Results:
The explosion vibration produces a level 7 signal, likely to be the "Prime Fuse" type.

Expected Results:
The vibration produces a level 15 "Explode" signal.

Notes: