The following class org.drools.workbench.models.guided.dtable.backend.GuidedDecisionTableProviderImpl used by drools compiler can't use IAction persistence extensions, as they're plugged via CDI. As this is model -> String conversion, I think it's enough to move "toString" logic into affected IActions.

"ERROR [org.drools.core.util.ReflectiveVisitor] (default task-24) no visitor implementation for : class org.optaplanner.workbench.screens.guidedrule.model.ActionSoftConstraintMatch"