[BUG] fastfetch failed to retrieve command output

Be sure to read the [FAQ](https://github.com/fastfetch-cli/fastfetch?tab=readme-ov-file#faq) before submitting a new issue.

# General description of bug:

* What happened: Command output is not displayed
* What should happen: Command output should be displayed
* Fastfetch version used: fastfetch 2.30.1 (aarch64)
* Did it work in an older version: N/A
* Where did you get the binary: Homebrew
* Does this issue still occur in [the latest dev build](https://github.com/fastfetch-cli/fastfetch/actions/)? N/A

# Often helpful information:

Screenshot:

N/A

The content of the configuration file you use (if any):
```
{
"type": "command",
"text": "/usr/bin/ssh-agent",
}
```

Output of `fastfetch -c ci.jsonc --format json`:

```
N/A
```

Output of `fastfetch --list-features`:
```
threads
vulkan
imagemagick7
chafa
zlib
sqlite3
```