I tried launching myself when gliding but The firework Launched as if I used it on the ground
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I have 2 Questions i would like to get answered to help you with this issue:
1. Did you look onto a block when clicking?
2. From where did the Firework start?

i was 100 odd blocks in the air and the fireworks started from my hitbox
Cannot reproduce. Could you post a screenshot of what's happening?