With the mini cart functionality included in Magento 2, users can simply view the contents of their carts and other information without having to go away from the current page and load the cart page.
The mini cart enhances any online store's in-store experience. However, whether a visitor adds or removes an item or makes any other modifications to the cart, the mini cart does not update, according to Magento developers.
The user experience has been damaged and has to be fixed.
For a programmatic resolution to this challenge and to update the mini cart Magento 2, Visit: https://meetanshi.com/blog/update-mini-cart-in-magento-2/