Users get an icon placed on their desktop at initial logon

I am now using the following settings in my master_preferences (which I deploy on every update):

"create_all_shortcuts":false,
"do_not_create_any_shortcuts":true,
"do_not_create_desktop_shortcut":true,
"do_not_create_quick_launch_shortcut":true,
"do_not_create_taskbar_shortcut":true

I am not seeing a desktop shortcut beeing created for now, but the new behavior is that there is an icon pinned to the taskbar.  After adding ""do_not_create_any_shortcuts":true" is seems fixed. 

It must be in the "distribution" part of the master_preferences file. My complete file is this:

{ 
"distribution":{ 
"msi":true,
"system_level":true,
"verbose_logging":true,
"msi_product_id":"2D0AE8FB-D52E-3D51-845F-FF1A7FFBB09E",
"allow_downgrade":false,
"create_all_shortcuts":false,
"do_not_create_any_shortcuts":true,
"do_not_create_desktop_shortcut":true,
"do_not_create_quick_launch_shortcut":true,
"do_not_create_taskbar_shortcut":true
}
}