Bad implementation of X25519?

const alice = await crypto.subtle.generateKey({ name: "X25519" }, true, [
    "deriveKey",
    "deriveBits",
]) as CryptoKeyPair;

const bob = await crypto.subtle.generateKey({ name: "X25519" }, true, [
    "deriveKey",
    "deriveBits",
]) as CryptoKeyPair;

const secret = await crypto.subtle.deriveBits(
    { name: "X25519", public: alice.publicKey },
    bob.privateKey,
    256,
);

console.log(secret);