Hi,
I encountered one scenario -
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Let's say we have four nested nodes. Expand the nodes one by one till the last nested children.
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Now, collapse at the most top-level parent, it would get collapse. But when expanded again, all nested nodes were found in the same open state.
Once collapsed at the parent level, all the sub-nodes should also collapse every time.
isOpenByDefault: false/true didn't help on this as it just helps to maintain an initial state of all nodes (whether to keep all nodes as in expanded or collapse state)