I need more posts like this and the vanilla ice cream one recently posted. Does the category of weird these problems belong to have a specific name or something?
Regarding the vanilla icecream one, shoddy design led to vapor lock, because the fuel lines run too close to the engine. But again, it was an edgecase, short drives, which are generally bad for cars, and mfgs dont do short drive tests that would catch that as part of their testing
Regarding the 500 mile email, again, another edgecase, where timeouts were reached due to distance. Distance wasnt factored in to testing, as it was not a necessary datapoint.
The phrase you probably want is just "edgecases".