I verified the exact same behavior on my end. The only way to get both myCircle and mySquare to show up is changing the data types of one of the parameters. Type def, strict type def, none of that changed anything. I'm going to talk to someone in R&D and, depending on their response, we might end up logging this as a Corrective Action Request and looking at fixing this in a future release. No guarantee on that, but it's definitely strange and, from my perspective, not intended behavior.
Senior Technical Support Engineer - FlexRIO, High Speed Serial and VRTS