projman #8891 crash for two resources with same role [open]

if the project_tasks include two resources with the same role, transforming the document to fo produces the following errors:

Creating FO rendering with "reponse-ao" stylesheets.
WARNING: Row #4 in table has more cells than expected.
WARNING: Row #5 in table has more cells than expected.
WARNING: Row #6 in table has more cells than expected.
WARNING: Row #7 in table has more cells than expected.
WARNING: Row #9 in table has more cells than expected.

and the transformation fails shortly after.