tpm2-tss libraries are not installed to the initrd. They are required for TPM unlock.

[Trumeet]

The hook sd-encrypt from cryptsetup will automatically copy tpm2-tss libraries to the initrd image [1], which is required by systemd to unlock LUKS partitions using TPM [2]. mkinitcpio-systemd-tool currently does not copy these libraries, so the unlock process will fail with TPM2 support is not installed. Could you include the related libraries in the hook? Thank you.

[gadgethm]

Would also like to see this functionality added!