hello @Salieri,
welcome to the purple universe 
if you use bluez, then note the following thread(briefly explained, it hangs with the bluez update)
This is how you can find out whether bluez is installed:
yay -Qs bluez
if then a result is there as by me
[pycrk@eno ~]$ yay -Qs bluez
local/bluez 5.67-1
Daemons for the bluetooth protocol stack
local/bluez-libs 5.67-1
Deprecated libraries for the bluetooth protocol stack
local/bluez-qt 5.107.0-1 (kf5)
Qt wrapper for Bluez 5 DBus API
local/bluez-utils 5.67-1
Development and debugging utilities for the bluetooth protocol stack
[pycrk@eno ~]$
then bluez( bluez 5.67-1) is installed on your system