I'm finding sticks and hoes in some fireworks' room dispensers. See screen-captures below. I'm running Roguelike Dungeons 1.12.2-1.8.0 on a SMP server running Forge 1.12.2-14.23.5.2769.

Ok, thanks.

The actual fireworks dispensers are on the surface. That's the control room, and those items give a 1 in 9 chance of the respective firework dispenser actually going off.