Kdevelop-snippet does not work under KDevelop 5.12.230805

Hi community,
if I insert this own snippet “${day()}.${month()+1}.${year()} ${hours()}:${minutes()}:${seconds()}h” into the Kdevelop editor, the data (May 5, 2025, 3:29:44 PM) appears correctly. If I use this instead:
"/** This file is part of ${project}
*

  • Copyright (C) %{year} %{fullname} <%{email}>

  • */", the placeholders (%{year} %{fullname} <%{email}>) only display the same text, namely “%{year} %{fullname} <%{email}>”
    This snippet is developed by stonemaster and part of his General Purpose C++ Snippets.