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Virtualization still renders all rows

We are a using a treegrid to display multi-hierarchical data with lots of elements.

When we are enabling virtualization and expand one of the root elements we are facing the issue, that ALL children rows are getting rendered in the html. We are expecting that virtualization also works on all levels and not only on roots.

In the attachment is an example where we can replicate this issue. Initially there are 12 rows which are rendered, which we can check by using "document.getElementsByClassName("e-row")". After expanding the first root we are again checking the rendered rows and we see that 1000 rows more were getting rendered.

Is this an bug in your library?