guix time-machine fails for 5b7a1cb0 (doesn't fail for the parent commit baab87ac). $ mv ~/.cache/guix/checkouts ~/.cache/guix/checkouts.1 $ guix time-machine --commit=5b7a1cb077931a020c0b7e3b12f12a7bda221d96 -- build hello Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'... guix time-machine: error: Git error: the requested type does not match the type in the ODB