I don't have access to the beta so I can't test on that version; that said, I'm not aware of changes to the scripts system so it should still work, make sure to use the script to change your tool or it won't work.
The script handles the switching and size change, and needs to be called (preferably through a hotkey) to work, if you change your tool using the buttons or directly through their specific hotkey the script is not engaged and it can't match the size.
Hope this helps.