Parallel branch reading: read at most once in parallel with 1 branch
Parallel branch reading: read at most once in parallel with 1 branch

fixing bug previously introduced which was preventing parallelisation.

olifre/root,karies/root,karies/root,root-mirror/root,root-mirror/root,olifre/root,olifre/root,karies/root,olifre/root,root-mirror/root,karies/root,karies/root,olifre/root,olifre/root,root-mirror/root,olifre/root,karies/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,karies/root,karies/root,root-mirror/root