The following (oversimplified) example produces a false positive:

type output struct {
	err error
	str string
}

func getValue(ch chan output) ([]string, error) {
	out := <-ch
	if out.err != nil {
		return []string{}, out.err
	}

	return []string{out.str}, nil
}

In our code there are more actions happening between the two returns, but the function signature is required to be like this to satisfy interface requirements