Start 13.0.1 with a clean config and do whatever it is you are doing, and tell me if there is something wrong or if it works.
I have tried using the visual mode keys to select a block (CTRL + V) and then used h,j,k, and l to extend it, and that seems to work fine. I also tried using Edit > Select > Block, and using the arrow keys to extend the selection, and that seems to work too.
- Ryan