FOLDER.TRASHED webhook v2 don't work

Hi Admin,

 I have a problem with the "FOLDER.TRASHED" webhook event. When I register webhook for a folder the "FOLDER.TRASHED" work for all sub-folders well. However, when I trashed the registered folder. I didn't reveive the "FOLDER.TRASHED" event for that folder. Could you explain why, and how to solve this. Thanks