A while back the back button was having problems on posts where there had been deleted items. A fix was applied but the appears to be happening again. In a thread with deleted posts I’m finding when the back button appears pressing it doesn’t do anything and the cursor never jumps to the latest unread post.
I’m having bad luck reproducing this one. I’ve tried entering a topic in the middle, scrolling up and hitting back and it seems to work. I then tried deleting the post I was looking at (using a different browser) and even some before it. It always seemed to work.
The “jump back” is based on the index of the post, so even if it’s deleted while you’re looking at it, it should always find a post in that general area. I’m not sure how the button would do nothing!
What web browser are you using? Any extensions that might be interfering?
I’m using safari on iOS as well as chrome on Windows. So pretty disparate as far as browsers are concerned. Unlikely that I have interfering extensions - especially on iOS.