A very odd real example is how Sony went backwards with passkey compatibility on their apps. It's I think what happened when they tried to have a single OIDC setup instead of multiple (PSN was a totally separate setup for the longest time and had it solved, but other parts of Sony, on a separate system, was almost wholly incompatible. The merging of the two made it impossible for their current webkit implementations to detect passkeys in say your 1password when it was working like a charming for years on PSN). This kind of stuff happens but to put it into production when it's almost immediately obvious that they screwed up is pretty wild.