Wrong display of number of projects to build

[gnodet]

➜  apache-camel git:(master) ✗ mvnd install -Dbuildtime.output.log
Building Camel :: Assembly  threads used/hidden/max:   1/0/11  progress:   0/481   0%  time: 00:26        :apache-camel:org.apache.maven.plugins:maven-assembly-plugin:3.0.0:single {execution: bin}

The display should be progress: 0/1 as we're not running from the reactor top level.