what is the correct way to update the bounding box in sdk v2?

Wouldn’t it work to set the size and position of the object to the size and position of the computed bounding box? The position of your computed bounding box would be the top left or its center depending on where you wanted the origin to be.

// SDK v1

let myinstance = this._inst.GetWorldInfo();

myinstance.SetXY(x, y);

// SDK v2

// Access the position property directly or use the methods provided

this.x = x;

this.y = y;

this.setBboxChanged();

This returns a runtime error, function not found.

There is no method because it ought to happen automatically. If it doesn't, please file an issue.