I have this template which captures clipboard content in file. It works fine when emacsclient is running, but if no client is running then server adds empty entry.

(add-to-list 'org-capture-templates
       '("x" "Clips" entry (file+headline "/home/user/desktop/clips" "Clips")
         "** %x" :immediate-finish t :prepend t))

System: 5.10.16-arch1-1
Desktop Environment: xfce
GNU Emacs 27.1