There is an issue during the BLE connection of the Fenix 6 watches. When I try to connect to my custom Bluetooth 5 device, I'm not able to connect to device due to the wrong BT Link Layer Channel Map. When I turn watches on and try to connect Garmin Fenix6 watches in CONNECT_IND packet sends Channel map value 0x18 which allows communication only on BT RF channels 37, 38. When I connect these watches to my Android mobile phone via BT and then try to connect to my custom BT device, then is CONNECT_IND Channel Map correct and I'm able to connect.
