Edge Case: Missing alerts / notifications for watched thread

[XFdestek]

Steps to reproduce

1. View a single page thread with 15 replies with account A and scroll down to the bottom
2. Scroll back to the top
3. Use another account B & browser to create a new reply in the thread
4. Go back to the browser from step 1)
5. Click Watch to watch the thread
6. Submit the overlay and leave the website

User expected result
The user does get an alert for a new post in this thread (and an email if enabled)

Actual Result
The user does not...

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