wicket:enclosure on wicket:extend - Detach called on component with id '0' while it had a non-empty queue

A page with wicket:extend and wicket:enclosure leads to a runtime exception

<wicket:extend>
<wicket:enclosure child="label">
The label: <span wicket:id="label">[label]</span>
</wicket:enclosure>
</wicket:extend>

–
ERROR - RequestAdapter - Error detaching page
org.apache.wicket.WicketRuntimeException: Detach called on component with id '0' while it had a non-empty queue: ComponentQueue

{queueSize=1, queue=[[Enclosure [Component id = wicket_enclosure0]], null, null, null, null, null, null, null]}

at org.apache.wicket.MarkupContainer.onDetach(MarkupContainer.java:1961)
at org.apache.wicket.Page.onDetach(Page.java:868)
at org.apache.wicket.Component.detach(Component.java:1145)
at org.apache.wicket.page.RequestAdapter.commitRequest(RequestAdapter.java:156)
at org.apache.wicket.page.AbstractPageManager.commitRequest(AbstractPageManager.java:82)
at org.apache.wicket.page.PageManagerDecorator.commitRequest(PageManagerDecorator.java:73)
at org.apache.wicket.page.PageAccessSynchronizer$2.commitRequest(PageAccessSynchronizer.java:258)
at org.apache.wicket.Application$2.onDetach(Application.java:1648)
at org.apache.wicket.request.cycle.RequestCycleListenerCollection$3.notify(RequestCycleListenerCollection.java:105)
at org.apache.wicket.request.cycle.RequestCycleListenerCollection$3.notify(RequestCycleListenerCollection.java:101)
at org.apache.wicket.util.listener.ListenerCollection$1.notify(ListenerCollection.java:120)
at org.apache.wicket.util.listener.ListenerCollection.reversedNotify(ListenerCollection.java:144)
at org.apache.wicket.util.listener.ListenerCollection.reversedNotifyIgnoringExceptions(ListenerCollection.java:113)
at org.apache.wicket.request.cycle.RequestCycleListenerCollection.onDetach(RequestCycleListenerCollection.java:100)
at org.apache.wicket.request.cycle.RequestCycle.onDetach(RequestCycle.java:645)
at org.apache.wicket.request.cycle.RequestCycle.detach(RequestCycle.java:594)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:297)
at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:284)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)