IDs of datatable columns are are wrong, p:columns bug?

[greenf]

I try to use PF-2.2.M1-SNAPSHOT for datatable with dynamic columns. I see that the following code in JSF2 component does not work correctly:

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<p:dataTable value="#{cc.attrs.managedBean.dataSource.rows}" 
				var="currRow" id="dataTable" rowIndexVar="rowIndex">
			<p:columns value="#{cc.attrs.managedBean.dataSource.columnNames}" 
					var="columnName" columnIndexVar="colIndex">
				<p:outputPanel id="cell_#{rowIndex}_#{columnName}">
					<h:outputText value="#{currRow.getCellValue(columnName)}"/>
				</p:outputPanel>		
			</p:columns>
		</p:dataTable>

The problem is with dynamic cell ID. The 'columnName' variable appears twice: in 'id' attribute value and as parameter for cell text. The result html is:

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<td><span><span id="j_idt56:gridExample:dataTable:1:cell__">BMW</span></span></td><td><span><span id="j_idt56:gridExample:dataTable:1:cell__">B4</span></span></td>

So, datatable can deal with dynamic text, but not with dynamic IDs. Is it a bug or I do something wrong?