Ignored mappings when using @InheritConfiguration

Expected behavior

When using @InheritConfiguration, if compilation succeed, all mappings from the inherited method must be used.

    @Mapping(target = "someAtribute", source = "source.attribute")
    @Mapping(target = "otherAttribute", source = "otherSource.anotherAttribute")
    public abstract Target mapFromSource(Source source, OtherSource otherSource);

    @InheritConfiguration(name = "mapFromSource")
    @Mapping(target = "otherAttribute", source = "source", qualifiedByName = "otherMapping")
    public abstract Target mapInherited(Source source, OtherSource otherSource);

    @Named("otherMapping")
    protected Long otherMapping(Source source) {
        return source.getAttribute() != null ? 1L : 0L;
    }

Actual behavior

from the example, when using mapInherited(), someAtribute mapping is ignored.

Steps to reproduce the problem

It seems that the bug was introduced in 1.4.2 and is still there in 1.5.5

MCVE: https://github.com/ymanvieu/mapstruct-inherit-mapping

MapStruct Version

Mapstruct 1.4.2