Yes it's bad to reuse dried out contact lenses.
You should never reuse any dried out contact lenses because the dried out contact lenses contain bacteria which can cause eye infections.
Dried out contact lenses have multiplied bacteria on the surface when they are exposed to air which can then infect the eyes.
If the contact lenses have dried out then you should throw them away and not reuse them otherwise you risk an eye infection.
Use fresh contact lenses when your other ones have dried out.