__cke_selected parameter displayed after inserting or editing a macro

Reproduction step:

• Create a page with a wikimacro containing the following code:

  {{velocity}}
  Parameters: $xcontext.macro.params.getParameterNames()
  {{/velocity}}
  

• Edit the page with WYSIWYG to insert your macro
• Save & view

Expected result:

• When inserting the macro in WYSIWYG no parameter should be displayed as when viewing the page

Obtained result:

• When inserting (or editing) the macro in WYSIWYG the parameter "__cke_selected" is displayed.