I've just published a new update to Google console and got this message:
How to do what they're asking for?APK not optimized
This APK creates unused code and resources that are sent to users. You could reduce the size of your application with the Android App Bundle format. Because you do not optimize your application for device configurations, it is larger than necessary for download and installation on users' devices. Large applications have lower installation rates and take up space on users' devices.
Use the Android App Bundle format to automatically optimize your app for device configurations, or manage it yourself with multiple APKs.