I am seeing this behavior as well - reading threads in Chrome on Android and then going back to them after seeing new posts using Chrome on desktop takes me back to the first unread post that I saw on Android....
My old low spec Android has this behaviour in default browser & Opera.
@Thuekr started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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I am seeing this behavior as well - reading threads in Chrome on Android and then going back to them after seeing new posts using Chrome on desktop takes me back to the first unread post that I saw on Android....