Preview does not work

### Checklist

- [X] I have read through the manual page (`man fzf`)
- [X] I have searched through the existing issues
- [ ] For bug reports, I have checked if the bug is reproducible in the latest version of fzf

### Output of `fzf --version`

0.55.0

### OS

- [ ] Linux
- [ ] macOS
- [X] Windows
- [ ] Etc.

### Shell

- [ ] bash
- [X] zsh
- [ ] fish

### Problem / Steps to reproduce

I am unable to see the preview window using FZF in git bash ZSH on windows.

The error states: `exec: C:\\Users\\{user}\\zsh": file does not exist`


Start by reproducing the preview failure with fzf 0.55.0 in Git Bash using zsh on Windows, after checking whether it still occurs in the latest version. Inspect the reported exec path error; done means the preview window opens without the missing-file error.

Written by the indexing model from the issue text.