supportedFanOscillationModes is null even though the ac supports

I have MIM-H04 WiFi kit to connect my Samsung VRF AC to the network.
When I use the smartthings-cli to get the supportedFanOscillationModes status, I get an empty value.
I checked the rest API too, and I got the same (I removed my device id):


My device support vertical Fan Oscillation Mode, and I can even set this in SmartThings app, but it is not available.

Hello @haimn, could you please tell me if the app is showing the same? or, what are the shown values? Thank you.

The app show both Vertical and Fix, but the API not:

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