OK. I see why they would have chosen to do that, and it disappoints me, but it seems to be weirdly more complex than that... this code prints the numbers in order (and continues to do so if you rearrange the calls to setImmediate and setTimeout or move them outside of the function either before or after)... so it is definitely returning from the function but it seems like the resolved value gets to jump the queue?

    (async () => {
        setImmediate(function() {
            console.log("4");
        });
        setTimeout(function() {
            console.log("3");
        }, 0);
        console.log(await new Promise((resolve, reject) => {
            console.log("0");
            resolve("2");
        }));
    })().catch();
    console.log("1");