If it is the case, changing the occurrences of '''ttyAMA0''' in /boot/cmdline.txt to '''serial0''' may fix missing Bluetooth ([https://forum.manjaro.org/t/new-raspberry-pi-kernels-related-packages/4721/344 Source]).
If it is the case, changing the occurrences of ttyAMA0 in /boot/cmdline.txt to serial0 may fix missing Bluetooth (Source).