< < And have you tried to select a single pentagon? One that is not piped?
a single who are not working is not working when it's selected alone!

All pentagons are not planar but normally a closed polyline or a cloded curve even not "planar" must makes a pipe!

<< C'est sont les vacances ... fainéants ! :)
Hélas pas encore! :(
Mais bientôt! :)