Another workaround:

ConvBean.java

@PostConstruct
public void postCon() {
	if (!FacesContext.getCurrentInstance().isPostback())
		if (conversation.isTransient())
			conversation.begin();
}

index.xhtml

<h:head>
	<f:metadata>
		<f:event listener="#{convTest.postCon}" type="preRenderView" />
	</f:metadata>
</h:head>

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