Debugging sources not shown in Chrome debugger


I have a probably simple problem. I created two angular projects, but seems that I forgot something in the second one (the second use a newer angular version [10 vs. 12]).

If I start my local server and open with F12 the chorme debugger, the second project only shows one main.js file with encrypted variable names etc.

The other project with angular v10 shows perfectly my source code folder with all files and the possibility to debug the individual files.

What’s wrong/missing with in the second project?

Thx a lot for your help.

Warm greetings

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