Animals can be killed by fireworks in creative.

In creative, animals can be hurt (And maybe even killed) if you elytra with fireworks, even if it isn't your plot.
Is there a way to remove damage from fireworks in creative?

 

I would ask a mod personally about this, It seems like something a player wouldn't know. If you accidentally killed someone's animal, you should inform them and say sorry. Hope this helped!

 

Fireworks, when they explode and we are in survival with an elytra you will get hurt, so, maybe it has the same concept for animals? I hope this information finds you well!