A lot of apps have cached experiences that they'll only show you if you have no network connection. If the app detects a very weak LTE connection, it'll try to load data over the network. That means that on a weak connection, I often end up being served nothing, rather than the data that's already cached on device.

As a tangent, I feel that a lot of these problems are fundamentally because engineers don't understand how poorly their software performs on unstable networks. Unless you live in a large metropolitan area with a well used underground transit network (in the USA, I suppose NYC would be the only qualifying city... sigh), you'd likely never experience these symptoms on a daily basis.