Angular Webpack:\\ folder not displayed in chrome dev tools

I have upgraded my app from angular 8 to angular 12, webpack:\ folder was displayed so I could search the sourcemap in devtools but when I upgraded to angular 12, it never displayed, I have tried many things to make it happen but nothing, I have also disable the production: false in the environment.ts but doesn't work. Also tried sourceMap: true in angular.json but didn't work. I am desperate now.

dev-tools image that doesn't display webpack:\\ folder