Getting this on Ubuntu 20.04 with stock kernel 5.7 from the Mainline PPA.
Logitech K380 keyboard.
[  229.061855] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[  229.061860] Bluetooth: HIDP socket layer initialized
[  234.275816] hid-generic 0005:046D:B342.0007: unknown main item tag 0x0
[  234.276115] input: Keyboard K380 Keyboard as 
/devices/pci0000:00/0000:00:01.3/0000:01:00.0/usb1/1-4/1-4.1/1-4.1.3
/1-4.1.3:1.0/bluetooth/hci0/hci0:65/0005:046D:B342.0007/input/input26
[  234.277362] input: Keyboard K380 Consumer Control as 
/devices/pci0000:00/0000:00:01.3/0000:01:00.0/usb1/1-4/1-4.1
/1-4.1.3/1-4.1.3:1.0/bluetooth/hci0/hci0:65/0005:046D:B342.0007/input/input27
[  234.277675] input: Keyboard K380 System Control as 
/devices/pci0000:00/0000:00:01.3/0000:01:00.0/usb1/1-4/1-4.1/1
-4.1.3/1-4.1.3:1.0/bluetooth/hci0/hci0:65/0005:046D:B342.0007/input/input28
[  234.278079] hid-generic 0005:046D:B342.0007: input,hidraw5: BLUETOOTH HID 
v42.01 Keyboard [Keyboard K380] on 00:1
a:7d:da:71:11


Keyboard won't pair, but can be "trusted" and "connected" and then it's usable. 
But doesn't reconnect automatically of course.

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https://bugs.launchpad.net/bugs/1385113

Title:
  hid-generic 0005:099A:0500.0001: unknown main item tag 0x0

Status in Linux:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Message with Mouse Bluetooth

  [   32.960478] hid-generic 0005:099A:0500.0001: unknown main item tag
  0x0

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-23-generic 3.16.0-23.31
  ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
  Uname: Linux 3.16.0-23-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  caravena   3344 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Fri Oct 24 05:22:54 2014
  HibernationDevice: RESUME=UUID=360bd2d2-4f44-4311-86d6-4781ac81ee87
  InstallationDate: Installed on 2014-09-25 (29 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 
(20140923)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.16.0-23-generic 
root=UUID=0fb75fae-baa3-428b-ace4-498e69ff7fb6 ro rootflags=subvol=@ quiet 
splash nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-23-generic N/A
   linux-backports-modules-3.16.0-23-generic  N/A
   linux-firmware                             1.138
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/15/2013
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: P14AAJ
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: SAMSUNG_NP1234567890
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: 0.1
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
  dmi.product.name: 530U3C/530U4C
  dmi.product.version: 0.1
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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