I have a 2018 Model 3 and I read that there's a design defect in the read underbody panel that causes it to detach (along with the rear bumper) when too much water gets in. Has anyone had any luck getting it replaced BEFORE there's an issue? Is it possible to order separately? I asked someone at a Service Center, but they said that they aren't able to order one for me. The panels for the 2019+ models also apparently come with a hatch for a tow hitch, whereas the 2018 ones don't.