Just for a bit of extra context - if you change ownership as the first edit to the post then it won’t bump, but if it’s the second+ edit then it will bump.
(And if the topic has a reply then no bump at all as the first post will no longer be the last post)
But for these you can Reset Bump Date afterwards to slide them back down into their original position again (either individually from the topic wrench or en masse using the Bulk Actions)