Test jdk: jdk13 build 10
Run following code with CLDR provider(-Djava.locale.providers=CLDR) and default provider:
    public static void main(String[] args){
        Locale nu_arab = Locale.forLanguageTag("zh-CN-u-nu-arab");
        Locale nu_arabext = Locale.forLanguageTag("zh-CN-u-nu-arabext");
        Locale nu_th = Locale.forLanguageTag("zh-CN-u-nu-thai");
        List<Locale> localeList = List.of(nu_arab, nu_arabext, nu_th);
        for (Locale locale: localeList) {
            System.out.println("Locale: " + locale);
            NumberFormat nf = NumberFormat.getNumberInstance(locale);
            System.out.println("Number: " + nf.format(-1234));
            NumberFormat cf = NumberFormat.getCurrencyInstance(locale);
            System.out.println("Currency: " + cf.format(-1234));
            NumberFormat pf = NumberFormat.getPercentInstance(locale);
            System.out.println("Percent: " + pf.format(-1234));
        }
    }
    
Actual result:
Run with CLDR provider(-Djava.locale.providers=CLDR):
  No minus sign before the number with locale zh-CN-u-nu-arab, zh-CN-u-nu-arabext, please refer to attached screenshot.

Expected result:
  Should show minus sign before the number.