Keytool not working with brainpool

[fco-code-org]

Hello,

Java 25 used.

Programmatically I am able to generate a brainpoolP256r1 keypair with this code
final KeyPairGenerator keyGen = KeyPairGenerator.getInstance("EC");
final ECGenParameterSpec ecps = new ECGenParameterSpec("brainpoolP256r1");
keyGen.initialize(ecps);
KeyPair keyPair = keyGen.generateKeyPair();

I have in a directory bcprov-jdk18on-1.86.jar
In this directory I ran this:
keytool -genkeypair -alias myBrainpoolKeyPair -keyalg EC -groupname brainpoolP256r1 -validity 365 -keystore myTestBKS.bks -providerpath bcprov-jdk18on-1.86.jar -providerclass org.bouncycastle.jce.provider.BouncyCastleProvider -providername BC -storetype BKS -storepass testbks
I was asked to answer for the DN
And when I enter yes, I got keytool error: java.security.SignatureException: Curve not supported: org.bouncycastle.jce.spec.ECNamedCurveSpec@3d285d7e

I made several tries like adding -J-cp -Jbcprov-jdk18on-1.86.jar, provide the full path for the -providerpath, add BC entry in java.security file, remove -providername BC in the command line without any success :-(

I am puzzled.

Best Regards.

[fco-code-org]

If I remove -providername BC in the command line, I got:
keytool error: java.lang.IllegalArgumentException: Curve not supported: brainpoolP256r1 (1.3.36.3.3.2.8.1.1.7)

So what's wrong ? Is it a bug ?