In fact, it is due to this line in prexec used to put the current command in 
the terminal title.
preexec() {
             print -Pn "\e]0;$1\a"
        }

I found this information here
https://bbs.archlinux.org/viewtopic.php?id=107834

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https://bugs.launchpad.net/bugs/435336

Title:
  zsh interpret some %[a-z] in command line

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