Comment 25 for bug 1385113

Ubuntu 18.04 still has the "unknown main item tag", occurring on a Thinkpad W520 after a suspend, but the Bluetooth Microsoft Sculpt Comfort Mouse now reconnects successfully.
dmesg grep ...
[34731.172621] hid-generic 0005:045E:07A2.0013: unknown main item tag 0x0
[34731.172743] input: Microsoft Sculpt Comfort Mouse as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0/bluetooth/hci0/hci0:11/0005:045E:07A2.0013/input/input33
[34731.175807] hid-generic 0005:045E:07A2.0013: input,hidraw2: BLUETOOTH HID v1.29 Mouse [Microsoft Sculpt Comfort Mouse] on 60:d8:19:b1:b6:75
[35612.593797] hid-generic 0005:045E:07A2.0014: unknown main item tag 0x0
[35612.593948] input: Microsoft Sculpt Comfort Mouse as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0/bluetooth/hci0/hci0:11/0005:045E:07A2.0014/input/input34
[35612.594158] hid-generic 0005:045E:07A2.0014: input,hidraw2: BLUETOOTH HID v1.29 Mouse [Microsoft Sculpt Comfort Mouse] on 60:d8:19:b1:b6:75