Hi John,
Greetings from Syncfusion support.
We have validated your reported issue and this is known issue in our end. We have already logged bug report for it. We will fix the issue and the fix will be included in our upcoming patch release which is scheduled on 28th August 2019. You can track the status of the reported issue from the below feedback link.
We have provided workaround details also in the above feedback.
Regards,
Gopi G.