Scheduled tasks executed twice if scheduled in a layer

[maxirozay]

Environment

Operating system	Linux 5.15.153.1-microsoft-standard-WSL2
CPU	unknown (12 cores)
Node.js version	v24.12.0
nuxt/cli version	3.34.0
Package manager	pnpm@10.12.1
Nuxt version	4.4.2
Nitro version	2.13.1
Builder	vite@7.3.1
Config	app, compatibilityDate, css, devtools, extends, i18n, routeRules, runtimeConfig
Modules	-

Reproduction

Nuxt repoduction:
https://stackblitz.com/edit/github-pupvohms?file=layers%2Fbase%2Fnuxt.config.ts
Just run it and check the logs. Every minute there will be 2 new logs from a single task.

Nitro reproduction:
I tried to recreate it with only nitro but no matter how I define the task it says "Scheduled task test is not defined!"
https://stackblitz.com/edit/github-bww96yvy?file=layers%2Fbase%2Fnitro.config.ts

Describe the bug

If a task is scheduled in a layer it is executed twice per execution.

If I put

   scheduledTasks: {
     '* * * * *': ['test'],
   },

in the nitro config from the project it is executed once per minute if I put it in the nitro config from the layer it is executed twice per minute.

It looks like when the configs are merged the tasks are duplicated. You can see in .nuxt/dev/index.mjs the tasks are defined with const scheduledTasks = [{"cron":"* * * * *","tasks":["test","test"]}];

Additional context

@pi0 as requested I report this issue in the nitro repo with a nitro reproduction except that in my reproduction nitro doesn't seem to see my task so I left the nuxt reproduction to see the bug but I guess you can easily fix the issue with my nitro reproduction.

Logs