Hello! First off, love this library so much, it's made my code so much more clean.

Simplified reproduction: https://codesandbox.io/s/red-https-bxpo0?file=/src/App.tsx

But anyways, I've run into this scenario recently and was able to resolve by resolving this locally - but, to be honest, I'm not really sure of the React internals enough to PR this + test. Anyways, the scenario

1. I want to use useEffectReducer in my own hook and export out it's dispatch so that other components can programmatically send out events to the reducer.
2. However, when I leverage the dispatch it emits events twice.
3. To resolve, you can useMemo the wrappedReducer .

const memoReducer = useMemo(() => wrappedReducer, []);

const [[state, effectStateEntityTuples, entitiesToStop], dispatch] = useReducer(
    memoReducer,
    initialStateAndEffects
 );