Can't add schema to route

Prerequisites

[X] I have written a descriptive issue title
[X] I have searched existing issues to ensure the bug has not already been reported

Fastify version

4.25.2

Plugin version

No response

Node.js version

20.10.0

Operating system

Linux

Operating system version (i.e. 20.04, 11.3, 10)

6.6.6-arch1-1

Description

I started the project with the command fastify generate my-project --lang=ts

Then I changed the file root.ts:

import { FastifyPluginAsync } from 'fastify'

const root: FastifyPluginAsync = async (fastify, opts): Promise<void> => {
  fastify.get(
    '/',
    {
      schema: {
        body: { type: 'object', properties: { x: { type: 'string' } } },
      },
    },
    async function(request, reply) {
      return { root: true }
    },
  )
}

export default root

After that I get this error:

[TypeScript] 19:15:37 - Found 0 errors. Watching for file changes.
[App] FastifyError [Error]: Body validation schema for GET:/ route is not supported!
[App]     at validateSchemaBodyOption (/tmp/teste/teste/node_modules/fastify/lib/route.js:569:11)
[App]     at Object.route (/tmp/teste/teste/node_modules/fastify/lib/route.js:210:7)
[App]     at Object.prepareRoute (/tmp/teste/teste/node_modules/fastify/lib/route.js:167:18)
[App]     at Object._get [as get] (/tmp/teste/teste/node_modules/fastify/fastify.js:259:34)
[App]     at root (/tmp/teste/teste/dist/routes/root.js:4:13)
[App]     at Plugin.exec (/tmp/teste/teste/node_modules/avvio/plugin.js:130:19)
[App]     at Boot.loadPlugin (/tmp/teste/teste/node_modules/avvio/plugin.js:272:10)
[App]     at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
[App]   code: 'FST_ERR_ROUTE_BODY_VALIDATION_SCHEMA_NOT_SUPPORTED',
[App]   statusCode: 500
[App] }

Other bug happens when I run fastify eject --lang:ts The commands generate a .js file.

Steps to Reproduce

Follow the description.

Expected Behavior