Expected behavior

react-scripts build packages build without error.

Actual behavior

react-scripts build fails with the error:

./src/styles/app.scss
ParserError: Syntax Error at line: 1, column 26
    at runMicrotasks (<anonymous>)

Resources (screenshots, code snippets etc.)

The contents of app.scss is...

@import 'mdb.pro.scss';

The contents of mdb.pro.scss is...

// MDB FREE
@import '~mdb-react-ui-kit/dist/scss/mdb.free.scss';

// MDB PRO
@import '~mdb-react-ui-kit/dist/scss/pro/variables';
@import '~mdb-react-ui-kit/dist/scss/pro/modal';
@import '~mdb-react-ui-kit/dist/scss/pro/perfect-scrollbar';
@import '~mdb-react-ui-kit/dist/scss/pro/sidenav';
@import '~mdb-react-ui-kit/dist/scss/pro/animate';
@import '~mdb-react-ui-kit/dist/scss/pro/lightbox';
@import '~mdb-react-ui-kit/dist/scss/pro/rating';
@import '~mdb-react-ui-kit/dist/scss/pro/timepicker';
@import '~mdb-react-ui-kit/dist/scss/pro/navbar';
@import '~mdb-react-ui-kit/dist/scss/pro/datepicker';
@import '~mdb-react-ui-kit/dist/scss/pro/popconfirm';
@import '~mdb-react-ui-kit/dist/scss/pro/datatable';
@import '~mdb-react-ui-kit/dist/scss/pro/stepper';
@import '~mdb-react-ui-kit/dist/scss/pro/sticky';
@import '~mdb-react-ui-kit/dist/scss/pro/select';
@import '~mdb-react-ui-kit/dist/scss/pro/loading';
@import '~mdb-react-ui-kit/dist/scss/pro/autocomplete';
@import '~mdb-react-ui-kit/dist/scss/pro/theme/theming';
@import '~mdb-react-ui-kit/dist/scss/pro/chips';
@import '~mdb-react-ui-kit/dist/scss/pro/multi-range';
@import '~mdb-react-ui-kit/dist/scss/pro/date-time-picker';

Additional Notes:

1. Using react-scripts start runs without issues.
2. Removing the @import 'mdb.pro.scss' line fixes the build.
3. Commenting out the entire contents of mdb.pro.scss also fixes the build.
4. Reducing mdb.pro.scss to just the first line repro's the broken behavior.