I chose gpt partition table, chose grub bootloader option, had one /efi/boot partition for boot, /, /home and linuxswap, I chose the three partitions to be encrypted with the same password.
I have tested the same thing on EndeavourOS with the exact same configuration and I did not have any issues installing it.
Using default configuration file: '/etc/mkinitcpio.conf'
==> ERROR: Hook 'openswap' cannot be found
==> WARNING: errors were encountered during the build. The image may not be complete.
It looks like your /etc/mkinitcpio lacks the hook for openswap.
This is needed since you have an encrypted swap partition for the module to open it to be built into the kernel image.
Perhaps you could edit your /etc/mkinitcpio.conf file and add it before running the installer.
Edit:
On a second thought, since the kernel images are built on the installed system, you would perhaps need to chroot into your installed system and edit the file as described above and rebuild the images.
Edit2: you would need the Edit2: you would need the mkinitcpio-openswap installed.
I don’t understand why is this an issue with cachyOS and not EndeavourOS? Both of them use calamares installers and on both systems I installed it exactly the same.