Reset bump date stopped working

[Moin]

@gerhard

Another new feature is the “ Reset Bump Date ” action in topic wrench menu.
It changes the topic’s bump date to the date of the last visible post in the topic.

Since your new post is the last visible post reset bump date does not work. It would work if you edit your post, which bumps the topic. Then it resets to the time the post was created. You could also delete ot, then you csn reset the date to match the first post.
Maybe the topic I quoted from is a help for you.