It's a workaround, but you could go to your account's General Settings on the main desktop site, and change the Default Thread Subscription Mode to "Instantly using Email, Push." Assuming you have your email app set to notify you for new emails, you'll at least see the emails telling you that you have a reply to a subscribed thread (although I'm not sure what the "Push" part means).
Moved this thread to the Android Central Apps forum, since that's where the developer checks for any issues that arise.