is chunking really fixed?

I was under the impression that with the changes in 4.0, the following should work:

#[test]
fn hash_chunking() {
    let c1: &[u8] = b"This hashing algorithm was extracted from the Rustc compiler.";
    let c2: &[u8] = b" This is the same hashing algoirthm used for some internal operations in FireFox.";
    let c3: &[u8] = b" The strength of this algorithm is in hashing 8 bytes at a time on 64-bit platforms, where the FNV algorithm works on one byte at a time.";

    let mut h1 = H::with_seeds(HASH_SEED_1, HASH_SEED_2, HASH_SEED_3, HASH_SEED_4);
    h1.write(c1);
    h1.write(c2);
    h1.write(c3);
    let hash1 = h1.finish();

    let mut c4 = Vec::<u8>::new();
    c4.extend_from_slice(c1);
    c4.extend_from_slice(c2);
    c4.extend_from_slice(c3);

    let mut h2 = H::with_seeds(HASH_SEED_1, HASH_SEED_2, HASH_SEED_3, HASH_SEED_4);
    h2.write(&c4);
    let hash2 = h2.finish();

    println!("hash1: {}, hash2: {}", hash1, hash2);

    assert!(hash1 == hash2);
}

But it fails on that last line. Is chunking still broken?