First of all, Google is a shell of the company it used to be.

That said, I’d actually argue there’s an evolutionary explanation behind this where at a certain size, and more importantly complexity, an oversight like this becomes even more likely, not less.

Stuff like this was proposed to be added to standard interviews, but they were too busy reversing binary trees

Security. The final frontier. Where no developer has ever bothered before.

in a company of this size ... left hand don't know what right hand is doing

Their “talent and expertise” is mostly in selling ads.

They probably used the in house AI tools to build this.