Module not found: Can't resolve './common.blocksAppRouterAppRouter.js' on windows

Failed to compile.
```
Error in ./src/index.js
Module not found: Can't resolve './common.blocksAppRouterAppRouter.js' in 'c:\work\<PROJECT_NAME>\src'

 @ multi ./~/react-dev-utils/webpackHotDevClient.js ./~/bem-react-scripts/config/polyfills.js ./src/index.js

import AppRouter from 'b:AppRouter';
```

It seems that `b:blah-blah` import missing slash on Windows.