Not sure what is going on, worked fine in 4.21 
Feel like I have the yipps and forgot everything overnight. Anyone else know if there is an issue? thanks
I ran into the same issue as you, and I found this post that talks about it.
It appears to be a bug with the engine when you enable ‘Dither LOD Transition’ in the material. I turned this off, and my grass popped back into existence. (Hope this helps!)