To reproduce:
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On mobile, go to this topic: https://meta.discourse.org/t/will-discourse-ever-gain-ignore-user-functionality/1525
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Filter by the OP’s posts by clicking on his username, and then “2 posts in topic”.
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Scroll down until you get to “46 hidden replies”. Click on it to open the hidden replies.
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Open the topic scrollbar by tapping on 2/48, use the scrollbar to scroll to the bottom of the topic.
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The topic stays on the filtered post with the 46 replies hidden again.