It solved.
Add devtool: 'source-map' config setting to packages\core\admin\webpack.config.dev.js file.
if (analyzeDuplicateDependencies === 'true') {
config.plugins.push(new DuplicateReporterPlugin());
}
return {
...config,
devtool: 'source-map', // << Setting for generating SourceMap
snapshot: {
managedPaths: [
path.resolve(__dirname, '../content-type-builder'),
path.resolve(__dirname, '../upload'),
path.resolve(__dirname, '../helper-plugin'),