为什么Facebook Pixel没有'；当嵌入iframe时，是否跟踪URL？

我注意到，当FB pixel嵌入到标准网页中时，它可以正常工作。 这就是它所做的调用：

https://www.facebook.com/tr/?id=PIXEL_ID&ev=PageView&
dl=https%3A%2F%2Fautotarget.co%2Fauto%2Faudi%2Fa6%2Fpr%2Femilia-romagna%2F-8-%2F48%2F&rl=&if=false&ts=1464110706891&v=2.5.0&pv=visible

https://www.facebook.com/tr/?id=PIXEL_ID&ev=PageView&
dl=https%3A%2F%2Fautotarget.co%2Fauto%2Faudi%2Fa6%2Fpr%2Femilia-romagna%2F-8-%2F48%2Fthankyou-call%2F&
rl=https%3A%2F%2Fautotarget.co%2Fauto%2Faudi%2Fa6%2Fpr%2Femilia-romagna%2F-8-%2F48%2F&
if=true&ts=1464107424477&v=2.5.0&pv=visible

我在Business Manager的Audience面板上看到了url

问题是当FB像素嵌入iFrame时。它似乎没有跟踪iframe URL。 这就是它所做的调用：

https://www.facebook.com/tr/?id=PIXEL_ID&ev=PageView&
dl=https%3A%2F%2Fautotarget.co%2Fauto%2Faudi%2Fa6%2Fpr%2Femilia-romagna%2F-8-%2F48%2F&rl=&if=false&ts=1464110706891&v=2.5.0&pv=visible

https://www.facebook.com/tr/?id=PIXEL_ID&ev=PageView&
dl=https%3A%2F%2Fautotarget.co%2Fauto%2Faudi%2Fa6%2Fpr%2Femilia-romagna%2F-8-%2F48%2Fthankyou-call%2F&
rl=https%3A%2F%2Fautotarget.co%2Fauto%2Faudi%2Fa6%2Fpr%2Femilia-romagna%2F-8-%2F48%2F&
if=true&ts=1464107424477&v=2.5.0&pv=visible

在这种情况下，dl参数是正确的URL，rl参数是嵌入iframe的页面的URL

你能帮我们吗