I was in the game trying to fly through a test world (Which I "nuked" with a high explosion a few times, then killed the entities that were items.), I crafted a flight duration 3 rocket. I jumped off my large glass box and enabled the elytra, I clicked on fireworks and they only went off, not boosting me.
Link To Video: Proof Video
The environment is only supposed to contain PC details.
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However, this issue is a Duplicate of MC-111480.
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