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What does 'Type: UNKNOWN' mean in the Master Control Panel app?

In the Androir master control panel app, in the scanner results there is a 'Type:' line for each device. Most of them around me say 'UNKNOWN' however some say 'BLE only'. I would have assumed it depends on the BrEdrNotSupported flag, but most devices have GeneralDescoverable | BrEdrNotSupported, yet some are 'UNKNOWN' and some are 'BLE only'.

From my scan through the list it looks like if the device doesn't have its name in the advertising packet it gets 'Type: UNKNOWN'. Why is that?

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