Spring UriComponentsBuilder.cloneBuilder() cause sharing query parameters between builders

Affects: 5.2.7.RELEASE

public static void main(String[] args) {
    UriComponentsBuilder b1 = UriComponentsBuilder.fromUriString("example.com");
    b1.queryParam("param", "x");
    UriComponentsBuilder b2 = b1.cloneBuilder();

    System.out.println("b1: " + b1.build().toUriString());
    System.out.println("b2: " + b2.build().toUriString());
    b1.queryParam("param", "y");
    System.out.println("b1: " + b1.build().toUriString());
    System.out.println("b2: " + b2.build().toUriString());
}

actual output:

b1: example.com?param=x
b2: example.com?param=x
b1: example.com?param=x&param=y
b2: example.com?param=x&param=y

expected output:

b1: example.com?param=x
b2: example.com?param=x
b1: example.com?param=x&param=y
b2: example.com?param=x