There's plenty of results in math and physics that are true, in the sense that the math checks out, but are useless, in the sense that the authors claim they've made a breakthrough, but actually they've just tweaked a few parameters of an existing unverified theory and constructed a new unverified theory. (If you've ever read a news headline like "physicists now believe reality may actually have 400 dimensions!", they were probably citing one of these papers.)

There are also plenty of physics papers where, the math actually just doesn't check out at all. But those, at least, rarely make it into headlines or reputable journals.