Warning: Computing just-done stamp in plan NIL for action

[Stas Boukarev]

More new warnings from ASDF 3.3, this time I have no idea what it means.

WARNING:
   Computing just-done stamp in plan NIL for action
(ASDF/LISP-ACTION:LOAD-OP
                                                     "system"), but
dependency (ASDF/FIND-SYSTEM:DEFINE-OP

"system") wasn't done yet!

The .asd file is not public, but it looks perfectly normal without using
any complicated features.
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