I remembered I needed to tweak some kernel setting with openSUSE a long time ago. It seems it is an specific issue of this laptop (Acer Aspire E15 laptop, model number E5-573-54ZV).
I needed to blacklist the acer_wmi kernel module:
echo 'blacklist acer_wmi' > /etc/modprobe.d/btconfig.conf
Then rebuild initramfs:
mkinitcpio -P
And, finally, reboot.
That’s it! My Bluetooth adapter is working now!
Just for reference, maybe it is useful for someone reading this thread in the future:
gnome-bluetooth-3.0 46.1-1 [Installed] extra
bluez-utils 5.77-1 [Installed] extra
bluez-libs 5.77-1 [Installed] extra
bluez 5.77-1 [Installed] extra
@BG405 thank you!