Since I use Latest as my main method for browsing, I’ve taken to using open in new tab for all posts, to avoid a refresh that will drop the whispers. But it seems to me that if the bump works once, it’s probably a bug that it doesn’t stay there? I’m not sure why you’d bump it once and then intentionally drop it.
As far as I’m concerned, that’s the opposite of a solution for me – I always want to see new whispers bump the topics. Even if someone has said something privately, they’ve still said something and I want to know about it.