commit 89110f96 upgraded asdf from 2.26.6 to 2.31.4.
asdf-bundle was merged into asdf 2.26.7.
asdf-bundle.lisp should have been dropped from the build during the upgrade.
Leaving the old asdf-bundle in place causes certain things (e.g., trying to upgrade asdf) to signal
SIMPLE-ERROR ORIGINAL-INITARGS is not a slot of #<monolithic-concatenate-source-op>
(Also, asdf 2.32 is out now.)