Why Anakin Couldn’t Sense Obi-Wan on Padme’s Ship

In Revenge of the Sith it made no sense as to why Anakin couldn’t sense Obi-Wan on Padme’s ship on Mustafar before their big fight. Darth Vader sensed Obi-Wan Kenobi on the Death Star, so why couldn’t Anakin here? The answer is from the legends (now) novel – The Rise of Darth Vader Thanks for watching everyone!! May the force be with you!!!