为啥 `split-string` 会影响 `replace-regexp-in-string` 的结果？

Emacs-general
1 
(defun replace-fun (match)
  ;(split-string "x-y" "-"); <- 有这句返回 "AB(abc|D)EF"，无此句返回 "ABabcEF"
  "abc")

(replace-regexp-in-string "(.+?)"
                          'replace-fun
                          "AB(C|D)EF" t)
2 
(defun replace-fun (match)
  (save-match-data
    (split-string "x-y" "-"))
  "abc")
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