While 3bb0f80 fixed most issues with fireworks damaging you, in certain cases this can still happen. These are the current ways I know to cause firework damage:

• Standing on farmland, a slab, trapdoor, etc. in a 4 block high area (specifically ~4.18-4.93 blocks to the ceiling from feet level)
• Walking into the firework in a cave (e.g. walking and jumping (no sprint) eastwards in a cave)

I think the only way to truly fix this is to give the player resistance or something.

Edit: I tried adding

effect give @s resistance 1 10 true

as the first command in bingo:item_detection/goals/completed_goal_effects and that seems to mostly solve the problem.

Relates to #10