Alternative solution - just for sake of completeness…
Bookmark to 'newest', rather than just the top level domain, e.g.
https://superuser.com/questions?tab=Newest rather than
https://superuser.com/
This will ignore bumped questions entirely & only show posts by 'last asked'.
It doesn't fix the issue, but it does mean you'll neither know nor care. This is actually my default bookmark style for all my regularly-visited stacks.
By way of explanation, if you go to the TLD, not only do you get Active by default, you also get no option for Newest in the menu at the top
If you look in the Burger menu, top left & select Questions…
You then get different 'sort by' options
I think you need to be signed in to do this.