Why doesn't the guest logout events fire when I close the browser or close the tab?

As the title says, when I close the browser or close the tab, the logout event doesn't happen for some reason.

If you do not close the browser or tab, you will be prompted for a login screen on the UI, and when you log in, the logout event will fire normally.

See below for my property values.
glide.guest.session_timeout:
Value: 5
glide.ui.session_timeout:
Value: 10

I don't know why the logout event doesn't occur.

Therefore, isn't the information based on the content of this knowledge uncertain?

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0825529

Or is there something I'm missing?

Best regards