Hi all - so I've just had a call with the devs about this. This is proving a really tricky Gremlin to pin down. And would hugely appreciate anyone who can help us identify what's going on. Let me give you the info I have:
Bookmarks have been working completely as they should for me - I have my posts set to "Show all" and I'm constantly bookmarking Site Stuff threads to make sure I've read every post on here. Every time I do it, it works exactly as it should. Even when I bookmark and then come back and move the bookmark further down the page.
On the call we tried two things
1 - we thought the issue might be when you have it set to "25 posts per page" and the bookmark was on a page later than page 1 - so we tried that, but that worked totally fine for us
2 - we then thought the issue might be when you had already bookmarked a thread and moved the bookmark to a later page - but again we tried that and it worked fine
So if people could post here exactly what they were doing when the bookmark didn't work that would be hugely helpful. As much detail as possible would be brilliant. Ideally details on the the device/browser you're using, whether you were bookmarking the thread for the first time (versus updating an existing bookmark), what the URL was, what you have your posts per page set to etc.
Hugely hugely appreciative for any help you can give us here in solving this issue.