cp command gives an error when running from a script file but not from command line

Describe the bug

I'm solving de Advent of Code 2022 and I have a short script that let's me initialize my template for solving the problems of a day. It goes like this:

def main [day_number: string] {
     let new_dir = $"day($day_number)/"
    cp -r day00 $new_dir
    code $new_dir
}

The cp command returns an error but when I run the same lines, one by one on the terminal, it just works!
Here's the error:

Error: nu::shell::directory_not_found (link)

  × Directory not found
   ╭─[initialize_day.nu:2:1]
 2 │     let new_dir = $"day($day_number)/"
 3 │     cp -r day00 $new_dir
   ·                 ────┬───
   ·                     ╰── directory not found
 4 │     code $new_dir 
   ╰────
  help: destination directory does not exist

This script worked fine in the previous version of nu I had installed, unfortunetly I don't remember which one it was, if I managed to get the version from the cache of pacman I'll update the issue with the version I had previously.

According to the pacman cache, the version I was using before was 0.71.0.

How to reproduce

1. Save the script above to a .nu file.
2. Have a dir named day00 in the same directory where you'll run the script.
3. Run the command using nu {filename}.nu 02.

Expected behavior

I expected nu to work in the same way that it did when I inputted the same lines one by one.

Screenshots

No response

Configuration

Additional context

No response

Start by reproducing the command from initialize_day.nu with Nushell 0.72.0, then compare it with running the same lines interactively using the provided day00 and day02 setup. Trace the cp invocation and its destination handling; done means the script and interactive command behave consistently, with a regression test covering the case.