@korina It doesn't for me ☺I just tried again, and the layer is not updating as the time slider progresses.
I presume the issue is because I'm using "Ungoogled-chromium", and WebGL in-particular seems to (intentionally) not work, so I think maybe Windy is falling back to some other rendering method which is unsupported/untested by the team. It's not a big deal to me anyway.