Slawomir Jaranowski opened MSHADE-480 and commented

When we rebuild project old shaded artifact is used.
m-jar-p doesn't rebuild a jar and shade plugin try shade again already

as workaround we can add

              <artifactSet>
                <excludes>
                  <exclude>${project.groupId}:${project.artifactId}</exclude>
                </excludes>
              </artifactSet>

No further details from MSHADE-480