Forums Bug Reports No indicators : channel close when not connected

Hello,
The is no indicators to know that a channel window is closed when not connected to a server.
Explanation:
Connection to a server
Joining a # channel
Keep this # channel open and disconnect to the server
Then the 'on part' event is not used when closing this # channel.
May be useful ti get this close in the on close event ?

I red the mIRC Help and i only found:
(on OPEN|CLOSE)
Note: These events do not trigger for any other types of windows. Channel windows are handled by the on JOIN/PART events.

Thank you

EDIT: mIRC 6.3