Casting of some SPAs doesn't work

[andrewmccafferty]

I tried to cast this website

https://birdtunes.net/?sort=active&station=18309&lang=en

I find that the main content of the page loads, but the data (which is loaded asynchronously) gets stuck and continuously loads. I'm not sure what the issue is, maybe something very specific about how the site above works, but I noticed it with another similar website (also trying to load bird data).

Any ideas what that might be? Really like the concept of this!