Don't typically use camera and other apps, but tried it and it's working fine on mine. S21 Ultra Exynos. Done a 3 minute recording while browsing YouTube as well, heated up to about 29C.
Try this, install AccuBattery, run it and look at the discharging tab. Scroll down to discharging speed and see what rate it says. For reference mine shows anywhere from 100 to 250mA sitting on that screen.
