localCompare not working with 'Umlaut' #7810

Environment
✔ Getting NativeScript components versions information...
⚠ Update available for component nativescript. Your current version is 5.4.2 and the latest available version is 6.1.0.
⚠ Update available for component tns-core-modules. Your current version is 5.2.0 and the latest available version is 6.1.1.
⚠ Update available for component tns-android. Your current version is 5.4.0 and the latest available version is 6.1.0.
⚠ Update available for component tns-ios. Your current version is 5.4.2 and the latest available version is 6.1.0.

Describe the bug
Using the localeCompare function to sort a list does not work with ¨ (the Umlaut german character). For example, the country Österreich appears at the end of my country list (so for example, after Vietnam)

To Reproduce
export class Country {
public name: string;
}

let countries: Array = ...;
countries = countries.sort((first, second) => {
return first.name == null ? -1 : first.name.localeCompare(second.name, 'de');
});

Expected behavior
Österreich should be for example between Norway and Poland and not at the end of the country list.

Sample project

Additional context
For countries without ¨ (Umlaut) it works as expected.