Please go on with your tests :-)
In fact for nested element it is not so good... It is KO, for all empty nested element, see:
and for nested element with element, the text-color is KO (always in black!) see:
Thanks for your support,Regards,Th.
Hello PlantUML team,On V1.2021.3 (22 Mar, 2021), for empty nested element, it seems to be good: but always KO for package, see:
Furthermore, text-color is KO (always in black!) see: