Tempered glass is one of those things that's a neat material but if you have a bad supplier then you'll be dealing with some shit.

We got a new freezer last year and it had tempered glass shelves. Randomly one day in the first month we heard a sound like ice tumbling out of an ice maker.

One of the shelves exploded. And after cleaning up all the glass the only conclusion I could come to was bad tempering QC. Which was corroborated by the repair guy fulfilling the warranty policy and replacing the shelf.