The `TxGraph.list_chain_txs()` method doesn't behave as you'd expect from the docs

When calling the TxGraph.list_chain_txs(chain, chain_tip) method, if you pass a chain_tip that does not belong in the chain, the method will simply return all transactions in your transaction graph, and transactions wil appear to be unconfirmed rather than the method letting your know that your chain_tip and chain are not currently compatible. The API docs for the method read:

List graph transactions that are in chain with chain_tip.

Consider the following example:

fn main() -> () {
    pub const RAW_TX_1: &str = "0200000000010116d6174da7183d70d0a7d4dc314d517a7d135db79ad63515028b293a76f4f9d10000000000feffffff023a21fc8350060000160014531c405e1881ef192294b8813631e258bf98ea7a1027000000000000225120a60869f0dbcf1dc659c9cecbaf8050135ea9e8cdc487053f1dc6880949dc684c024730440220591b1a172a122da49ba79a3e79f98aaa03fd7a372f9760da18890b6a327e6010022013e82319231da6c99abf8123d7c07e13cf9bd8d76e113e18dc452e5024db156d012102318a2d558b2936c52e320decd6d92a88d7f530be91b6fe0af5caf41661e77da3ef2e0100";
    let tx: Transaction = tx_from_hex(RAW_TX_1);

    let mut graph = TxGraph::<ConfirmationTimeHeightAnchor>::default();
    graph.insert_tx(tx.clone());

    let confirmation_time_height_anchor2 = ConfirmationTimeHeightAnchor {
        anchor_block: BlockId {
            height: 2,
            hash: Hash::hash("second".as_bytes()),
        },
        confirmation_height: 2,
        confirmation_time: 100,
    };

    let chain = LocalChain::from_blocks(
        [
            (0, Hash::hash("zero".as_bytes())),
            (1, Hash::hash("first".as_bytes())),
            (2, Hash::hash("second".as_bytes())),
            (3, Hash::hash("third".as_bytes())),
        ]
            .into_iter()
            .collect::<BTreeMap<u32, BlockHash>>(),
    ).unwrap();

    graph.insert_anchor(
        tx.txid(),
        confirmation_time_height_anchor2
    );

    let block_4 = BlockId {
        height: 4,
        hash: Hash::hash("fourth".as_bytes()),
    };

    let txs = graph.list_chain_txs(&chain, block_4);
    println!("Transactions: {:#?}\n", txs.collect::<Vec<_>>());
}

This example will print to the console

Transactions: [
    CanonicalTx {
        chain_position: Unconfirmed(
            0,
        ),
        tx_node: TxNode {
            txid: 0xd6f6c49aadcc8f5a3d5997b8e564acf443af0dd7d6bb2e5b34d68d9ea90c9838,
            tx: Transaction {
                version: 2,
                lock_time: Blocks(
                    Height(
                        77551,
                    ),
                ),
                input: ...

instead of warning the user that they provided a chain tip that does not exist in the chain.

I opened this issue to ask whether this is intended behaviour (and we can modify the docs to reflect that) or whether this might be a small bug.