Fastify 1733 -- Lifecycle is not interrupted when onSend executes asynchronously

index.js

'use strict';

const fastify = require('fastify')();

const promiseTimeout = ms =>
    new Promise(resolve => {
        setTimeout(resolve, ms);
    });

// This issue occurs with both callback and promise based `onSend` hooks
fastify.addHook('onSend', (request, reply, payload, done) => {
    setTimeout(() => {
        done(null, payload);
    }, 50);
});
// fastify.addHook('onSend', async (request, reply, payload) => {
//     await promiseTimeout(50);
//     return payload;
// });

fastify.route({
    method: 'GET',
    path: '/',

    // With this hook, the handler is still called
    preHandler: async function(request, reply) {
        console.log('GET / -> preHandler()');
        reply.redirect('/login');
    },

    // With this hook, the handler is not called (as expected)
    // preHandler: function(request, reply, next) {
    //     console.log('GET / -> preHandler()');
    //     reply.redirect('/login');
    // },

    handler: function(request, reply) {
        console.log('GET / -> handler() !! This should never be shown !!');
        reply.send({ hello: 'world' });
    }
});

fastify.route({
    method: 'GET',
    path: '/login',
    handler: function(request, reply) {
        console.log('GET /login -> handler()');
        reply.send('Please log in\n');
    }
});

fastify.listen(3000, err => {
    if (err) throw err;
    const { port } = fastify.server.address();

    console.log(`server listening on port ${port}`);
});