Villagers can get hit by their own firework

When a raid is beaten and villagers are celebrating, they can get hit by their own firework and eventually die from it. This happens when a transparent block is on the way between the villager and the and the sky. Apparently this does not when there is a non transparent solid block as it prevents the villager from shooting their rocket (making them know they are actually in the "inside").

How to reproduce.

1. Has a villager standing inside a cage made of glass and no other block between the sky and the villager.
2. Start a raid, and be victorious.
3. Watch the villager hitting himself with the rocket.