Decorator Design Pattern with HashMap returning empty HashMap

I am trying to implement Decorator design pattern for HashMap.

I have two Decorators - "UpperCaseHashMap" and "AddHashMap".

However, the result map contains only the effect of one of the decorators, example :-

Map<String, String> map = new AddHashMap<>(new UpperCaseHashMap<>(new HashMap<> ()));
map.add("aa", "aa");
System.out.println(map);

• Only AddHashMap effect i.e. result is - {AA=AA}

  Map<String, String> map = new UpperCaseHashMap<>(new AddHashMap<>(new HashMap<> ())); map.add("aa", "aa"); System.out.println(map);

• Only UpperCaseHashMap effect i.e. result is - {aaADDED_BY_DECORATOR=aa}

Below is the code of the decorator classes:-

public class UpperCaseHashMap<K, V> extends HashMap<K, V> {

/**
 * 
 */
private static final long serialVersionUID = 1L;

Map<K, V> map;

public UpperCaseHashMap() {
    map = new HashMap<>();
}

UpperCaseHashMap(Map<K, V> map) {
    this.map = map;
}

public V put(K key, V value) {
    String temp = key.toString().toUpperCase();
    key = (K) temp;
    return super.put(key, value);
}

}

public class AddHashMap<K, V> extends HashMap<K, V> {

/**
 * 
 */
private static final long serialVersionUID = 1L;

Map<K, V> map;
AddHashMap(Map<K, V> map) {
    this.map = map;
}

public V put(K key, V value) {
    String temp = key.toString().concat("ADDED_BY_DECORATOR");
    key = (K) temp;
    return super.put(key, value);
    
}

}