It looks like this behavior may have changed, at least for top-level tasks. I just did a quick test:
- I created Task 1 assigned to me
- I created Task 2 assigned to me
- I made Task 2 dependent on Task 1
- I marked Task 1 complete
- I went to my Inbox to check if I received a notification. I did NOT receive a notification
Is there a way to re-enable these notifications? Is it possible this is a bug? In case it is I also reported it at Not receiving notifications when dependent tasks are complete