Dependency reduced pom (DRP) is generated only if resulting shaded artifact was 'renamed'
However, the documentation regarding DRP states:
Flag whether to generate a simplified POM for the shaded artifact. If set to true, dependencies that have been included into the uber JAR will be removed from the <dependencies> section of the generated POM. The reduced POM will be named dependency-reduced-pom.xml and is stored into the same directory as the shaded artifact. Unless you also specify dependencyReducedPomLocation, the plugin will create a temporary file named dependency-reduced-pom.xml in the project basedir.
Default value is: true.
It's not stating any changes in this flag behavior, by this hiding the conditions upon which DRP would be generated.
This should be fixed, and DRP should be generated whenever the flag is being set to 'true'