The bug

Eyes of Ender summoned with commands always shatter.

Expected result

Summoned eyes of ender would have a 10% chance of shattering as hand-thrown eyes of ender do.

To reproduce

1. Run /summon eye_of_ender near 0,0.
2. Do it many times.
Notice how none of them drop eyes.
Interestingly, they all play the sound as if they were fine.

Code analysis

Code analysis by tryashtar can be found in this comment.