I don’t know why solar panels have to be this reflective
Because those types of solar plants don't use photovoltaic cells, they use mirrors to focus sunlight to a point where the resulting heat is used to generate electricity. So, same basic effect as using a magnifying glass to start a fire to anything that passes through that.
They're also mostly falling out of favour, losing out to photovoltaic panels. Which are simpler to make, operate, and are vastly cheaper to boot, while also not being reflective (They are protected by a layer of glass, so there's a minimum amount of reflection simply because they're smooth, but they're not mirrors).