Wikimedia Bugzilla is closed!

If you revisit a page you've recently seen, it shows the same notification count as when you last visited the page. The count itself is generated as part of the page (not pulled from JS), and since the cache headers of the page aren't supposed to allow caching, I'm not sure why this bug exists. The cache headers for each page are:
Cache-Control	private, must-revalidate, max-age=0
Expires	Wed Dec 31 1969 16:00:00 GMT-0800 (PST)

Shouldn't that prevent the page from being cached by the client?

Steps to reproduce:
1. Load the Main Page and note what the notification count is
2. Perform some action that generates a notification for yourself (for example, leave a talk page message with another account)
3. Soft-refresh the Main Page

You'll see that the notification count is still the same. If you hard-refresh the page, however, it will update the count.