Solution: On Self-moderated threads when the author deletes the post intended for bumping their bump to the first page will be voided and they will go back to the page where they last stayed.
I don't think this is going to work. They usually leave the bump and only delete it to post a new one.
So, imagine the situation:
1. OP posts a bump; Thread goes to the first page.
2. When the thread is down, he deletes the bump; Thread goes a few pages back;
3. OP posts a bump again; Thread again on the first page.