Why huge difference in breathing rate between Breathwork and Health Snapshot?

I did breathwork with peaced ratio of 6 breaths per minute and then Health snapshot with the same breath rate.

During Breathwork Garmin Fenix 7S detected respiratory rate correctly - 6 bpm.
During the Health snapshot, it shows - a double value - 12 bpm.
Why is it so massive an error in the respiratory rate?

It should be vice versa - more accurate data during Health snapshots than Breathworks.