Aria scale and iPhone Healthkit

Suusik

Hello,
I was using Wi-Fi Aria scale connected to Fitbit and it counted my weight and fat %
I was able to check it inside Fitbit application.
Now I switched from Fitbit to Apple Watch. I still keep Aria scale and Fitbit as connected devices in MyFitnessPal and could check the progress inside iPhone HealthKit application.
For some reason HealthKit displays only my weight BUT not fat %.
My question: does anyone else experience this weird behavior ? I consider it's quite convenient to check fat % as well and it's not clear why HealthKit does not use it as as a source ..
Any advice?
Thanks