Pause tracking HR Bug

Hello, I’m actually not sure this is a BUG or “by design”.
My config:
Sleep as android (latest fromGP) + Notify for Amazfit (latest from GP) + Bip S.
When I run sleep tracking, pause tracking (30 min. in my case) wroks fine for the accelerometer sensor of wearable, is not used, but the HR sensor starts working immediately, ignoring the pause. The battery of the wearable device is spent in empty.

Notify app setting: Built-in sleep monitor (sleep analysis) off. “Monitor heart” off.
Notify app setting for SaA on default (HR 2 min.),
Sleep as android settings-wearables: HR monitor on, Bluetooth Smart off.