[Q/BUG] Programs running under junest can't access the original OS programs?

E.g., I have Zsh at `/home/feri/.junest/usr/bin_wrappers/zsh`. When I run this shell, it no longer finds `tar`. But running `/usr/bin/zsh` (which is not under junest), we have:
```
❯ where tar
/usr/bin/tar
/bin/tar
```

I think this is expected behavior?