React-Redux: Combining reducers: Unexpected Keys

I think you simply need to add reducers for the additional keys, e.g.

function one(state = {}, action) {
  switch (action.type) {
  case ONE_UPDATED:
    return action.one
  default:
    return state
  }
}

From the docs:

If you produced reducer with combineReducers, this must be a plain object with the same shape as the keys passed to it. Otherwise, you are free to pass anything that your reducer can understand.

If you don’t need to handle any actions related to one or two, just pull them in initially, this could be as simple as

export default combineReducers({
  events,
  flash,
  one: (state = {}) => state,
  two: (state = {}) => state
})