I have noticed that when Guix is building derivations, the progress bar for what it's currently building will often reverse to somewhere between 5% and 50% after reaching 100%. In some cases, such as for guix-packages- base.drv and guix-packages.drv, this happens several dozen times before the build is actually complete.
This is a bug. Progress bars should *never* go backward. It is actually better to have no progress bar at all than to have one that gives a misleading sense of how close the operation is to completion. zw
