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

[ElrohirGT]

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

key	value
version	0.72.0
branch	makepkg
commit_hash	8fa965118c2e5a0beaa528d07eaf9b33d96779cb
build_os	linux-x86_64
build_target	x86_64-unknown-linux-gnu
rust_version	rustc 1.65.0 (Arch Linux rust 1:1.65.0-1)
cargo_version	cargo 1.65.0
pkg_version	0.72.0
build_time	2022-11-30 06:57:53 +00:00
build_rust_channel	release
features	database, default, trash, which, zip
installed_plugins

Additional context

No response

[fdncred]

I'm wondering if it makes any difference if you change this

cp -r day00 $new_dir

to this

cp -r day00 ($new_dir)

[ElrohirGT]

Well I just tried that right now and it doesn't haha the error is the same.

[KAAtheWiseGit]

Bizarrely, this still produces an error, even with the uutils cp:

/tmp/mine> nu script.nu 02
Error:   × is not a directory
   ╭─[/tmp/mine/script.nu:2:1]
 2 │     let new_dir = $"day($day_number)/"
 3 │     cp -r day00 $new_dir
   ·                 ────┬───
   ·                     ╰── is not a directory
 4 │ }
   ╰────

Whereas both cp -r day00 day02 and cp -r day00 $new_dir work.

[fdncred]

I bet it's related to https://github.com/nushell/nushell/pull/10843 and https://github.com/nushell/nushell/issues/10832