明明加载了法语文件，为什么有些文字仍来自基础文件？

import java.net.URLClassLoader;
import java.nio.file.*;
import java.util.*;
public class BundleParentDemo {
    static int checks;
    static void check(boolean ok) { if (!ok) throw new AssertionError(); checks++; }
    public static void main(String[] args) throws Exception {
        Path dir=Files.createTempDirectory("qinghuan-bundles-");
        try {
            Files.writeString(dir.resolve("Messages.properties"),"hello=ROOT_HELLO\nhelp=ROOT_HELP\n");
            Files.writeString(dir.resolve("Messages_fr.properties"),"hello=FR_HELLO\n");
            Files.writeString(dir.resolve("Messages_fr_CA.properties"),"currency=CA_CURRENCY\n");
            var control=ResourceBundle.Control.getNoFallbackControl(ResourceBundle.Control.FORMAT_PROPERTIES);
            try (var loader=new URLClassLoader(new java.net.URL[]{dir.toUri().toURL()},null)) {
                try {
                    ResourceBundle ca=ResourceBundle.getBundle("Messages",Locale.CANADA_FRENCH,loader,control);
                    check(ca.getLocale().equals(Locale.CANADA_FRENCH));
                    check(ca.getString("currency").equals("CA_CURRENCY"));
                    check(ca.getString("hello").equals("FR_HELLO"));
                    check(ca.getString("help").equals("ROOT_HELP"));
                    check(ca.containsKey("help"));
                    System.out.println("selected="+ca.getLocale()+"; currency="+ca.getString("currency")+"; hello="+ca.getString("hello")+"; help="+ca.getString("help"));
                    check(new TreeSet<>(ca.keySet()).equals(new TreeSet<>(Set.of("currency","hello","help"))));
                    System.out.println("visible_keys="+new TreeSet<>(ca.keySet()));
                    ResourceBundle fr=ResourceBundle.getBundle("Messages",Locale.FRANCE,loader,control);
                    check(fr.getLocale().equals(Locale.FRENCH));
                    System.out.println("request=fr_FR; selected="+fr.getLocale()+"; hello="+fr.getString("hello"));
                    ResourceBundle jp=ResourceBundle.getBundle("Messages",Locale.JAPAN,loader,control);
                    check(jp.getLocale().equals(Locale.ROOT));
                    System.out.println("request=ja_JP; selected=ROOT; help="+jp.getString("help"));
                    boolean missing=false;
                    try { ca.getString("unknown"); } catch(MissingResourceException e) { missing=true; }
                    check(missing); check(control.getFallbackLocale("Messages",Locale.JAPAN)==null);
                    System.out.println("unknown_key=MissingResourceException; default_locale_retry=disabled");
                } finally { ResourceBundle.clearCache(loader); }
            }
        } finally {
            try(var paths=Files.walk(dir)) { for(Path p:paths.sorted(Comparator.reverseOrder()).toList()) Files.delete(p); }
        }
        check(!Files.exists(dir));
        System.out.println("PASS checks="+checks+"; temporary_files_cleaned=true");
    }
}