It lookes like it ignores managed dependency entries in parent poms.
common usecase is spring/spring boot applications, it then picks the wrong versions and application does not start.

example:
parent => org.springframework.boot:spring-boot-starter-parent:2.0.0.M1
which includes managed dependency for e.g. jackson-core:2.9.0.pre3 but jrun picks 2.6.1