I'm testing this build on Raspberry Pi 3B+.
I paired a bluetooth keyboard: Genius Y-X5A77.
Bug #1 (also present in older versions, including 8.2.5):
Enable bluetooth and spend some time in Bluetooth menu, where the devices are listed.
Exit and enter again. All devices are shown twice.
After a while, the list is refreshed and all the devices are listed once, as normal.
Bug #2:
Settings / LibreELEC / Bluetooth / <keyboard device> / Enable Standby crashes Kodi.
The crash log might be this one, but I'm not sure, because I had multiple crashes. http://ix.io/1lgf
Bug #3:
I restored a backup made in v8.2.5. At that time, the keyboard was paired. After restore, BT keyboard automatically connected but didn't work (pressing keys had no effect) and trying to delete the device from BT menu crashes Kodi.