Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the issue has not already been raised

Issue

https://fastify.dev/docs/latest/Reference/Hooks/#respond-to-a-request-from-a-hook

This code here

fastify.addHook('onRequest', (request, reply, done) => {
  reply.send('Early response')
})

// Works with async functions too
fastify.addHook('preHandler', async (request, reply) => {
  await something()
  reply.send({ hello: 'world' })
  return reply // mandatory, so the request is not executed further
})

The above docs imply that both hooks will run and returning reply is mandatory to stop processing, but in my experiments I found this to not be true.

There is also this issue that seems to back me up

#677