https://wccftech.com/how-to/this-13-inch-macbook-pro-bug-requires-8-hour-charging-to-fix/ > The 2019 13-inch MacBook Pro with two Thunderbolt 3 ports) has a weird bug which requires at least 8-hour charging as part of the fix. In case your 13-inch MacBook Pro keeps shutting down, despite showing sufficient battery charge, follow the below steps to fix the issue. > This workaround has been provided by Apple on its support website. In step 5, Apples suggest charging the Mac for at least 8 hours, before updating to the latest version of macOS. This is a strange solution and is likely related to battery recalibration.