Well, I finally tested the cause of the crash.
When I drew for the first time, I selected the "tyicon001" object, and the system will crash immediately when I click it. At this time, cancel the drawing, do not select anything, and click to draw the line again, and then there is no problem. Strictly speaking, this is not a "bug", but it does cause Max to crash.
By the way, when there are no objects in the scene, drawing curves will also crash
When I drew for the first time, I selected the "tyicon001" object, and the system will crash immediately when I click it. At this time, cancel the drawing, do not select anything, and click to draw the line again, and then there is no problem. Strictly speaking, this is not a "bug", but it does cause Max to crash.
By the way, when there are no objects in the scene, drawing curves will also crash