On an iPhone 14, I’ve had this come up regularly. There are two reasons that I think are causing it.
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The vertical touch interaction is blocked or disabled temporarily. The solution that works for me is to swipe an item left or right to either reset or re-enable scrolling and touch gestures. Then the vertical scrolling will work again.
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The feed load time - when the swiping left or right fix doesn’t work, it generally seems like it’s because the page is waiting to load and update additional items. I can see this happening more often when I’m on a slow network connection and then on fast Wi-Fi it’s just a slight pause and the feed loads.
Because it’s all I really want to do here.