Fenix 6 silver battery not charging fully

Hi, I saw a strange behaviour with my Fenix 6 Silver, on the last  times of charging.

It would not go to 100% percent. It stops at 96, or 97%. It won't go higher.

I just need to know whether this is a (new) feature (battery over charge protection, long time protection etc) or a bug in the form of showing just wrong percentage digits.

Anyone encountered this behaviour?