EOS disappeared from Boot menu; sudo parted -l only shows thumb drive

[pebcak]

@hwmpunk

1 1049kB 106MB 105MB fat32 EFI system partition boot, esp

If you are using systemd-boot then this partition cannot be the correct ESP.
EnOS requires an ESP of the size 1000 MB for systemd-boot.

Therefore:

@hwmpunk

dracut: *** Creating image file '/efi/0b8ff3b98d7243189d2aef5522035508/6.4.3-arch1-1/initrd-fallback' ***
cp: error writing '/efi/0b8ff3b98d7243189d2aef5522035508/6.4.3-arch1-1/initrd-fallback': No space left on device
dracut: Creation of /efi/0b8ff3b98d7243189d2aef5522035508/6.4.3-arch1-1/initrd-fallback failed

More probable, this one is the relevant ESP:

@hwmpunk

9 422GB 423GB 1049MB fat32 boot, esp