In that edit: User:Test3544535452 edits the topic title, and hit save, without making any actual changes.
This "no-change action" currently would not get saved in the database, with regular wikipages (see [[WP:Null edit]]). It shouldn't in Flow, either.
A null edit should be ignored and not saved as an edit.
Note that this is also used as a workaround for T59991: Changes in templates are not immediately reflected in Flow posts which transclude those templates (and similar issues), so possibly should be fixed in conjunction.