[Win10] Uptime not tracked when screen locked?

I have a pretty standard Windows 10 system that’s set to stay on, never sleep. I lock the screen when I’m away or sleeping, so the monitors will turn off ASAP.

However, looking at my pulses, it looks like WhatPulse only tracks uptime when the screen is on, maybe? Or maybe there’s another reason, but that seems the most likely. I saw such behavior mentioned in another thread about something else, and decided to start my own instead of hijacking.