CSS Invalid output for scientific e notation

[genesistms]

Simple component:

@Component(selector: 'my-app', template: '', styles: [':host { width: 1e-9px; }'])
class AppComponent {}

Results of generated css:

// style.css.dart
final List<dynamic> styles = [':host {\n  width: 1e-9px;\n}\n'];

// style.css.shim.dart
final List<dynamic> styles = ['._nghost-%ID%{width:1 e-9px}'];

Note space before e-9px.

dart2js/webdev does not matter
Tried simple dart2js without angular and style was passed corectly.

Small app for replicate problem here

Dart SDK version: 2.10.5 (stable) (Tue Jan 19 13:05:37 2021 +0100) on "linux_x64"
Angular version: ^6.0.1