This is absolutely something that already happens with fully human developers, but it seems likely to be much more frequent and not caught as soon with AI assistance.
This also seems like a failure mode that could go pathologically wrong on a regular basis for TDD types.
Nah. It will just be tons and tons of trivial, straight forward code, calling other trivial code, that calls more trivial code.
Yes, some of it will be created manually, but if you go with "the IA created it" you will get it right 99% of the time. And obviously, the more code, the more it will fail; but people always try to fix this with more code.
Remember the times of Enterprise Java?
I feel like companies will start using watermarking to avoid the AI dumping GPL into their codebase.