Description of the issue:
So I'm adding in drops for when blocks are destroyed by explosions, however the drops don't occur with Immersive Engineering as the Gunpowder Barrel doesn't fire the ExplosionEvent.Detonate and BlockEvent.BreakEvent (Ref codetaylor/dropt-1.12#68).
Would it be possible to add this functionality to the Barrel?

Versions & Modlist
Minecraft: 1.12.2
Forge: 14.23.5.2838
CraftTweaker: 4.1.20
Dropt: 1.17.0
Immersive Engineering: 0.12.-92

BlockEvent.BreakEvent is fired when a player breaks it. Not an explosion.

ExplosionEvent.Detonate is dispatched by ForgeEventFactory.onExplosionDetonate(), which IE calls. That event is used for the entities targted by an explosion, not the blocks.

Neither of these events does what you want it to.