I have the exact same problem with two different ASUS computers. After an update in December 2024, both stopped recognizing the battery. I have contacted ASUS support on several occasions, but the only solution they suggest is performing a factory reset to see if the problem persists.
It is completely unacceptable that after an official update, two laptops stop functioning correctly and that no real solution is offered to resolve the issue. This points to a significant issue with either the update or the devices themselves, and customers should not have to endure such inconveniences without adequate support.