It’s fairly easy to fix that manually to some extent if you aim for a G2 deviation of about 0,01 (good enough for general product design other than cars for manufacturing) by manual point adjustment via Gumball for a minute or so, but it takes a lot more time to reduce the G2 deviation to less than 0,005.
This video shows an example of how to reduce the G2 deviation. My first attempt before the video recording was quicker and I achieved 0,001 maximum deviation, but then the recorded attempt got much worse as I didn’t do the adjustments properly. Still, even at 0,01 the G2 deviation is visually smooth for most purposes. I call this G1,9 for obvious reasons…
Another bug shown in this video is graphical. The latest build of Rhino 9 Beta will ignore the object colour and will only switch to the proper coloured object rendering mode when the control points are turned on. This particular bug was introduced recently, so my hope is that the developers could figure out what causes it easily and fix it in the next build of Rhino 9 Beta.