run the attachment radiogroup-rerender-simplified.zul
click in the following sequence
1. "refresh tree"
2. "rerender radio group"
3. "refresh tree"
4. "rerender radio group"
after 2nd time refreshing the tree, it is no longer possible to re-render the radio group resulting in a JS error:
re-rendering the radio group
this only happens when "org.zkoss.zul.client.rod" is enabled for the tree
this still worked in 8.5.0
when debugging through the JS code the radio._group refers to a Treeitem-widget instead of a Radiogroup
disable client-rod for the tree