[BUG] columnGroup rendered attribute doesn't work

[bumble.bee]

I'm using the rendered attribute on p:column elements to hide row totals. This works fine.

However, when using the rendered attribute on the p:columnGroup (type="footer" to display column totals) nothing happens. I can move the rendered logic to the child p:row element and it works (except the style is bad because bottom border is missing from table!)