Why dark light on grass?

https://drive.google.com/drive/folders/1nmxDg4R4CIBE-di6Z0g8MQg6Wz600eN1?usp=sharing
In my project, for some reason, the grass is black as in the second preview, but when I created a new absolutely clean project, created a terrain and material, loaded the same grass for both projects and set up the material in the same way as seen in these two images, in the new project the grass is displayed without black artifacts, and in the old project the grass is dark, why? how to fix it?