No items with "find|grep" scanner

With `(setq magit-todos-scanner #'magit-todos--scan-with-find|grep)`, I get a `*magit-todos--scan-with-find|grep*` buffer with lines like
```
./init-eshell.el:3481:;;; TODO: ls: Sort using locale.
```

So I guess that part works.

Nothing items get printed in the magit status buffer however.

Any clue?