I think useEffect works now

Author: chriswillsflannery

package/linkFiber.js

@@ -87,7 +87,7 @@ module.exports = (snap, mode) => {
       // we only want to changeUseState (which updates and sends the snapshot)
       // on the last item in the memoizedState chain. This makes sure it doesn't double-push
       // values to the timeline.
-      if (memoizedState.next === null) {
+      if (astHooks[index + 2] === undefined) {
         changeUseState(memoizedState);
       }
       // memoized[astHooks[index]] = memoizedState.memoizedState;

package/timeJump.js

@@ -28,7 +28,7 @@ module.exports = (origin, mode) => {
       let index = 0;
       const hooks = returnState();
       // while loop through the memoize tree
-      while (current) {
+      while (current && current.queue) {
         current.queue.dispatch(target.state[hooks[index]]);
         // Reassign the current value
         current = current.next;