From the article:
"The issue stems from the primer applied before gluing the optional light bar to the windshield (no fasteners are used in the attachment of the light bar)."
Honestly, the original price they announced ~US$40K) is still way too high for what seems to be a vehicle that is slapped together. It feels like the production line looks like that episode of I Love Lucy where Lucy and Ethel are working the line at a chocolate factory.