Hello Leo,
> If you look at https://ci.guix.gnu.org/eval/13652 you can see that the > evaluation of the derivation seems completed but there's no pending > builds. If you have a look to https://ci.guix.gnu.org/specification/edit/core-updates you will see that this specification is configured to build to "core"[1] subset of the "core-updates" branch with the "4" priority. The 13652 evaluation does not trigger any new derivation in the core packages subset, hence there are no triggered builds. When there are some new derivations to build, like for the 12656 evaluation, because of the low priority, they can stay pending for a long time. Thanks, Mathieu [1]: http://guix.gnu.org/cuirass/manual/html_node/Specifications.html#Specifications
