I think the reactions that Musk and Holzhausen had tell the story. They were not expecting that to happen at all. Also, as noted in another story[0], the hori

I think the reactions that Musk and Holzhausen had tell the story. They were not expecting that to happen at all. Also, as noted in another story[0], the horizontal plane didn't break at least in part because it wasn't fixed rigidly in place, and thus was able to distort. [0] https://www.thedrive.com/news/31158/tesla-cybertrucks-armored-windows-break-during-on-stage-durability-test https://www.thedrive.com/news/31158/tesla-cybertrucks-armore...