"/websocket/closed" is not working in IE11

[Maxim Solodovnik]

Hello All,

I just have noticed "/websocket/closed" is not working in IE11
handler set via
Wicket.Event.subscribe("/websocket/closed", function() {})
Is not fired

The following message displayed in console instead:
SCRIPT12030: WebSocket Error: Network Error 12030, The connection with the
server was terminated abnormally

Wicket: 8.0.0-M5
OS: Win7/Win10
Browser: IE11/Edge

Should I file JIRA?

-- 
WBR
Maxim aka solomax