websocket failing when desktop recycle is enabled

Steps to Reproduce

enable desktop recycle

	<listener>
		<listener-class>org.zkoss.zkmax.ui.util.DesktopRecycle</listener-class>
	</listener>

reload a page to trigger desktop recycling

Current Result

the websocket connection doesn't start reliably, after a page reload

Expected Result

websocket starts after a page reload

Debug Information

initally the we connection is started:

after a page reload the start script is missing (not always but often)

Workaround

disable desktop recycle