Iphone 14PM battery health degradation

So I have had my phone for 1 month and half, and yesterday when I have checked the battery health it showed 99. I am pretty sure it dropped after updating to 16.2.

So I have digged deeper, and I have checked the analytics file to find the maximumFFC capacity of the battery which was 4520 which is above the minimum capacity of 4323 mAh.

So back to my question, is it even possible to lose 347 mAh from the battery capacity in just 25 cycles?

Or could it be that the latest update (16.2) messed up with the values?

And just to clear up that I have always used the 20-90 rule when it comes to charging and I have always used the original 20W charger.

Any help will be appreciated!