Hi Arkady,
I just came across with your post here. I understand how this can catch you off guard after an upgrade. What’s happening is your laptop likely has Lenovo’s Conservation Mode turned on, which limits charging to around 60% to help extend battery life. It’s a built-in feature, not a fault. You can check this by opening the Lenovo Vantage app and looking under Battery Settings.
If Conservation Mode is enabled, switch it off to allow full charging. While you’re at it, make sure your power management drivers and BIOS are up to date from Lenovo’s support site. If the issue persists, try a quick power reset: shut down, unplug the charger, hold the power button for 30 seconds, then restart.
Do you usually keep the laptop plugged in most of the time, or do you run it on battery often?
Regards,
Rez