How Kiara Advani lost a movie to Rashmika Mandanna because of her viral ad?

Recently Rashmika Mandanna's viral ad with Vicky Kaushal made her the national crush of the country. She is soon going to make her debut in Bollywood with Sidharth Malhotra in Mission Manju. This Movie was first offered to Kiara but because of date issues went straight to Rashmika