The given reason is simply that it will return control to the driver if it can’t figure out what to do, and all evidence is consistent with that. All self-driving cars have some variation of this. However yes it’s suspicious when it disengages right when you need it most. I also don’t know of data to support whether this is a pattern or just a feature of certain well-published cases.
Even in those false positives, it’s entirely consistent with the ai being confused, especially since many of these scenarios get addressed by software updates. I’m not trying to deny it, just say the evidence is not as clear as people here are claiming