Yup, a cell has died - that can be deduced by the 98% after the charge number.
This has nothing to do with an update but a result of wear and tear - that is just how it is.
One can prolong the life of a modern batter by avoid charging to full (100%) capacity and avoid deep discharge (0%).
This is a known issue with batteries - search the Contributions > Tutorials for utility script charge notifier
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