We are currently on implementing a component for data grids using the Kendo React Grid and virtual scrolling.
The problem is that the "page down" and "page up" is not working correctly, because of the virtualization (We already contacted the support for it).
Here is a stackblitz where the problem can be reproduced: https://stackblitz.com/edit/react-rapzu9?file=app/main.tsx
Reproduction steps:
1. Click inside the grid
2. Press "Page down" - Page changes, but focus goes to the header cell
3. Press "Page down" again - Nothing happens

Another problem which maybe has the same source is navigating with the arrow keys.
Reproduction steps:
1. Scroll somewhere deeper down
2. Use arrow up to scroll up again
3. At some point it scrolls not up anymore but the focus also changes into the header cell - Not okay

In my opinion its a bug, at least for the arrow keys. If you disagree please open a feature request for it, this functionality will be needed by out customers.

Best regards

Yui