I can not logout from AEM Author

I think that it is probably a bug of Author, I am in trouble because I can not logout from Author.

If you are directly accessing Author, I can logout correctly.

However, if I attempt to log out via Dispatcher, I cannot log out.

If I investigate the requesting URL using Fiddler,

normal logout case is that http request is made in the order of the URLs listed below

/system/sling/logout.html

/

/libs/granite/core/content/login.html?resource=%2F&$$login$$=%24%24login%24%24&j_reason=unknown&j_reason_code=unknown

/libs/granite/csrf/token.json

On the other hand, logout possible case is below

/

/content/dam/myapp/products.folderthumbnail.jpg?width=280&height=240&ch_ck=1518007087000

/content/dam/myapp/projects.folderthumbnail.jpg?width=280&height=240&ch_ck=1518022030000

/content/dam/myapp/resources.folderthumbnail.jpg?width=280&height=240&ch_ck=1518005778000

That's right. not accessing /system/sling/logout.html first !

Try using "ModHeader" chrome extention, "Server - Agent: Communique - Dispatcher"

The same phenomenon occurred when accessing Author directly with a header.

In other words, it is a proof that the behavior of Author changes when you go through Dispatcher and directly access it.

Please tell me the solution to this problem.

Thanks for the help!