It seems to me that the current post number (and by consequence - I assume - which posts are registered as read) is updating rather late on mobile. By “late” I mean that you have to scroll down quite far for the counter to increase:
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@eviltrout worth a look, once it undocks it should probably special case and change to last post.
Let’s try this out:
https://github.com/discourse/discourse/commit/5fda2b84e19c1dbcffcc6fb19a35cee12ca587c5
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