To Repro:
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Go to Topic List Previews 
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Filter by someone’s posts, effect easier to see if you filter by someone with less posts eg 
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Go to the bottom and open “n hidden replies”. If you filtered by the above user it’d be 436 hidden replies at the time of writing. 
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Scroll up some amount using the discourse scrollbar, the topic “reloads” and closes the previously opened replies. 
