A DESCRIPTION OF THE PROBLEM :
The attached code works on all Java versions except 21

REGRESSION : Last worked in version 17.0.9

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
x.509
ACTUAL -
unable to decode, extra data

---------- BEGIN SOURCE ----------
import java.security.*;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;

public class PublicKeyTester {

    public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeySpecException {
        String keyString = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAkN6m/iR+PREcXJfFCaqoohUuteSau4NISwfXXl3yts3C424GuKUS6+3LDJ96xvVMolPBe8haurs1ms1miIq/8CdGlcrAw4FjPCBTZNHdpRA/R75K5crahTieSZalj+ccpOuS9CJujKs8/PLcJeOsXMeOon5XV5Z9laI1tJk8Z9ULPdqxCaHbEWI9RdMGEU8rTlILZSA1+bbh/hLUA6x/BlCAu8wO+Q+e1eWACRkLouCNP67C9xJlfKlzibUnjFOSdmsaJtZgh5BEWkTQeaMO6o6DUhjIwrnVCjfk9O+RcoGYMi6VmpNcAtCFGTB38APpTsu39Sm6MzngNw2fy2AcmwIDAQAB+33pFTKFkH7p2hxZAnUZb5Ji4Uk6RldhsNQJzugoEpJLzkveRTsor+AmrdAiRDY7bNLatnvZnhtrlaCnyT/qGebaYMaXVg88Zb/XlCcAU+NkrXvqF0EvTFqnW46k2tLhFPJS6sKnwkSUTPGWWeBb5j6TPAXR0Ral5g9PHnbAhvyVawVmy9M7NIpVf9OZy9PjQIDAQAB";
        byte[] keyBytes = Base64.getDecoder().decode(keyString);
        X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(spec);
        System.out.println(publicKey.getFormat());
    }
}

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FREQUENCY : always