Expected Results
Posts that were read should be marked as read indefinitely.
Actual Results
Posts in the middle of a subscribed thread randomly keep appearing unread again in the subscribed threads section, and can’t be reliably marked as read by scrolling past the affected post.
Steps to Reproduce
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Participate in a discussion thread, and make sure to be subscribed about updates (user preferences).
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Scroll through all posts so that all posts are marked as read (outlined badge).
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Wait until the discussion continues and new posts are created.
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Repeat 2), and wait for a couple of hours.
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Go to the subscribed threads page, discover that a thread is marked as updated (filled out badge).
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Tap on the badge and the navigation will jump to a random post in the middle of a thread (you can make sure that there are no new posts by navigating to the end of the thread).
Note: This bug appears randomly, but often enough that reproduction shouldn’t be an issue. As I don’t understand why posts are marked as unread in the first place this could be also two issues.