Samsung Galaxy Note 9 (crownlte)
Smart Charging from version 2.4 build 29.03.2022 did not work on my ‘crownlte’. The default setting was 90 percent. However, the battery was charged up to 100%.
Xiaomi Mi 9 (cepheus)
Here too, ‘cepheus’ version 1.7 build 29.03.2022 , 90 percent was preset. I could see live how the phone buzzed briefly and stopped charging when it reached 90%. So the software works here.