Hi John,
Thank you for your interest in Syncfusion Products.
I was not able to reproduce the condition that you have mentioned here.
I have attached the sample which I used to reproduce the issue that you have mentioned here with this post.
You can download the sample from the below given web page link,
http://websamples.syncfusion.com/samples/Diagram.Windows/F61526/main.htmCould you please modify this sample to reproduce the condition that you have mentioned here and send it back to us?
Thanks & Regards,
Ramya.