I tried to configure my BT mouse via the Plasma BT widget. It tells me there are no adaptors, even though the mouse is working, the BT dongle's light is on, the kernel modules are loaded:
$ sudo lsmod|grep -i blue bluetooth 483328 28 bnep,hidp,btbcm,btrtl,btusb,rfcomm,btintel rfkill 24576 4 bluetooth
and systemd shows BT as running:
$ systemctl |grep -i blue sys-devices-pci0000:00-0000:00:1a.0-usb3-3\x2d1-3\x2d1.2-3\x2d1.2.1-3\x2d1.2.1:1.0-bluetooth-hci0-rfkill2.device loaded active plugged ANYCOM_Bluetooth_USB-250_UHE sys-devices-pci0000:00-0000:00:1a.0-usb3-3\x2d1-3\x2d1.2-3\x2d1.2.1-3\x2d1.2.1:1.0-bluetooth-hci0.device loaded active plugged ANYCOM_Bluetooth_USB-250_UHE sys-subsystem-bluetooth-devices-hci0.device loaded active plugged ANYCOM_Bluetooth_USB-250_UHE sys-subsystem-rfkill-devices-rfkill2.device loaded active plugged ANYCOM_Bluetooth_USB-250_UHE bluetooth.service loaded active running Bluetooth service bluetooth.target loaded active active Bluetooth
This is with the latest updates to kf5 etc. as of this morning.
poc