since the last release all addon-artefacts also provide their source code via Maven (*-source.jar). Unfortunately there was a bug in our build-process for org.eclnt.eclntpbc - which did not contain the .class files, but the .java source files...
We corrected this. But, of course the exsiting artefact is wrong. We just published an interima version 20210707_INT1, in which the artefact is correct.