Power BI JavaScript API userculture does not work correctly today multi-language reports

When we embed a report we perform the following:-

    const lang = this.user ? this.user.profile['locale'] : 'en-GB';

    const config: any = {

      type: 'report',

      id: this.id,

      embedUrl: this.embedUrl,

      accessToken: this.accessToken,

      tokenType: pbi.models.TokenType.Embed,

      settings: {

        filterPaneEnabled: true,

        navContentPaneEnabled: true,

        layoutType: this.layout,

        localeSettings: {

          language: lang,

          formatLocale: lang

        }

      }

    };

    const divElement: HTMLElement = <HTMLElement>this.powerBIReports.nativeElement;

    this.powerbi.reset(divElement);

    this.report =  this.powerbi.embed(divElement, config);

You can see from the example above that we are passing a culture in the localeSettings

Within our report itself we have a dax expression similar to:-

VAR UC = CALCULATE(MIN(usercultures[Locale]),FILTER(usercultures,usercultures[Code] = USERCULTURE()))

Return  UC

The USERCULTURE() no longer resolves to the culture passed in when embedded (see highlighted red), it evaluates as en-US

We have also logged this as a ticket with Microsoft.