Unfortunately, IJ API requires us to return instances of
PsiClass/PsiMethod in order to proceed with run configuration creation.
In fact, those instances will be queried only by trivial requests, like
containingFile or name. Therefore, full-blown LightClasses are not
needed and even harmful, because for some declarations we can not build
proper light classes (like for expect declarations, for example)
Previously it mostly worked because most of declarations in common
indeed have corresponding Light-instances (because common source-set can
be seen from Java through JVM-part of a project).
^KT-34503 Fixed
Dmitry Savvinov