The following applies for subtargets at any level

How to reproduce :

• Use a CommonController (via the ButtonController for example)
• Configure the controller with a "selection-subtarget-type" config parameter in reverse mode (with a leading '!'). For example, !^content$
• The CommonController match any message without subtarget or with a subtarget of type 'content'.
• Instead, CommonController should match any message without subtarget or with a subtarget that is not of type 'content'.