Fireworks can be placed in the offhand, yet do not work when trying to boost while already in the air, or when trying to launch with the elytra
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That's why I posted this, because a limited amount of items can go into the offhand in bedrock, so fireworks being able to makes me think that it's supposed to work, yet it doesn't. So hopefully this gets fixed in a way that makes it work, rather than it not being able to go in the offhand, because it is a really nice feature that is only currently working on Java.
I don't believe they have ever worked in the off hand on Bedrock Edition, It would be nice but that is a feature on java only.