From the preferences page:
This is a special subscription--you will not see yourself as "subscribed" to applicable items, but you will receive content for them.
so it makes sense that you wouldn't see them as individually subscribed. Tell you what, it's easy enough to test: add a reply to this image, which I loaded well before the new subscription system. If I get notified of your reply, we'll know that 'Replies to my content' it's working.