Is that so hard to believe? My work uses proprietary language. Something like ABAP for SAP [1]. AI has ingested lot of documentation available on the internet. But it cannot tell the difference between versions. So, AI code often has correct but deprecated functions.

And don't get me started on the "time savings" for boiler plate documentation. It messes up every time.

[1]: https://en.wikipedia.org/wiki/ABAP