Even if a project using shadow doesn't configure minimizeJar=true, the UnusedTracker is instantiated. This is a) unneccessary and b) fails sometimes in multi-module projects. See #425 and related PRs: #477 and #478 (which both introduce new erros) for details on those failures.

So, what about not creating an instance of UnusedTracker at all when minimize is not requested?

The failures described in b) are not touched by this issue.