iPad Pro M4 no longer showing Battery Maximum Capacity
I bought a new iPad Pro M4 in August 2024. For the first three months, I always used it while connected to power, and maybe once or twice a week, I would use it on battery until it dropped to 20%, then charge it back up to 80%. However, in late November, the iPad suddenly stopped showing the maximum battery capacity as it used to. Instead, under the Maximum Capacity settings, I now see the message: 'iPad must be regularly used while not connected to power to show maximum capacity. Learn more' along with a link to a page explaining the reason.
Since then, I have been using it on battery and never while connected to power, but even after months, it still does not show the Maximum Capacity. I contacted Apple Support, but they had no idea how to resolve this issue. Resetting the iPad also didn’t help.
Has anyone else experienced this issue? Any recommendations?
iPad Pro 13-inch (M4) running the latest iPadOS 18.3.1
iPad Pro, iPadOS 18