$ sudo mhwd-kernel -li
Currently running: 5.10.105-1-MANJARO (linux510)
The following kernels are installed in your system:
* linux510
* linux512
* linux54
* linux59
(I don`t see linux 5.12 in my “Advanced options menu”, only 5.10 and older ones. It isn’t part of the Boot options text. I checkd that by pressing “E” to start the editor)
$ sudo ls /etc/mkinitcpio.d/*.preset
/etc/mkinitcpio.d/linux510.preset
/etc/mkinitcpio.d/linux512.preset
/etc/mkinitcpio.d/linux54.preset
/etc/mkinitcpio.d/linux57.preset
/etc/mkinitcpio.d/linux58.preset
/etc/mkinitcpio.d/linux59.preset
$ sudo ls /boot/
amd-ucode.img
efi
grub
initramfs-5.10-x86_64-fallback.img
initramfs-5.10-x86_64.img
initramfs-5.12-x86_64-fallback.img
initramfs-5.12-x86_64.img
initramfs-5.4-x86_64-fallback.img
initramfs-5.4-x86_64.img
initramfs-5.7-x86_64-fallback.img
initramfs-5.7-x86_64.img
initramfs-5.8-x86_64-fallback.img
initramfs-5.8-x86_64.img
initramfs-5.9-x86_64-fallback.img
initramfs-5.9-x86_64.img
linux510-x86_64.kver
linux512-x86_64.kver
linux54-x86_64.kver
linux59-x86_64.kver
memtest86+
vmlinuz-5.10-x86_64
vmlinuz-5.12-x86_64
vmlinuz-5.4-x86_64
vmlinuz-5.7-x86_64
vmlinuz-5.8-x86_64
vmlinuz-5.9-x86_64
$ sudo ls /lib/modules/
5.10.105-1-MANJARO
5.12.19-1-MANJARO
5.4.184-1-MANJARO
5.9.16-1-MANJARO
extramodules-5.10-MANJARO
extramodules-5.12-MANJARO
extramodules-5.4-MANJARO
extramodules-5.9-MANJARO