布尔值+ while循环=

我对下面的代码有一个奇怪的问题(我已经剥离了不相关的部分，并且引用的任何类/函数都按预期工作):

int curNumRooms = 0;
while(curNumRooms < numberOfRooms) {
    int w = Random.Range(minimumRoomSize, maximumRoomSize+1);
    int h = Random.Range(minimumRoomSize, maximumRoomSize+1);
    int x = Random.Range(0, (int)levelSize.x - w - 1);
    int y = Random.Range(0, (int)levelSize.y - h - 1);          
    Rectangle newRoom = new Rectangle(x,y,w,h);
    bool failed = false;
    foreach (Rectangle otherRoom in rooms) {
        if(otherRoom != null) {                 
            if (newRoom.Intersect(otherRoom)) {
                failed = true;
                break;
            }
        }
    }
    if (!failed) {          
        rooms[curNumRooms] = newRoom;
        curNumRooms++;
    }
}

由于某种原因，failed的计算结果总是为true。我抛出了几个调试消息，奇怪的是，计算失败了两次——第一次，在foreach循环中，它的计算是正确的。第二次，它的计算结果为false。如果我将failed初始化为true，那么第二次它的计算结果为true，几乎就像while循环运行了两次，第二次忽略了foreach循环。

为什么会这样?

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编辑1:这是我的矩形类和相关变量:

public class Rectangle {
        public int x1;
        public int y1;
        public int x2;
        public int y2;
        public bool Intersect(Rectangle other) {
            return (x1 <= other.x2 && x2 >= other.x1 && y1 <= other.y2 && y2 <= other.y1);      
        }
        public Rectangle(int x, int y, int w, int h) {
            this.x1 = x;
            this.x2 = x+w;
            this.y1 = y;
            this.y2 = y + h;
        }
        public Rectangle() {
        }
        public Vector2 Center() {
            int centerX = (x1 + x2) / 2;
            int centerY = (y1 + y2) / 2;
            Vector2 center = new Vector2(centerX, centerY);
            return center;
        }
    }

下面是我使用的变量:

public Vector2 levelSize = new Vector2(80,30);
public int maximumRoomSize = 10;
public int minimumRoomSize = 5;

public bool Intersect(Rectangle other) {
    return (x1 <= other.x2 && x2 >= other.x1 && y1 <= other.y2 && y2 <= other.y1);
}

public bool Intersect(Rectangle other) {
    return (x1 <= other.x2 && x2 >= other.x1 && y1 <= other.y2 && y2 >= other.y1);
}