Hi Uwe,
Greetings from Syncfusion support.
We have confirmed this as a bug and logged defect report for the same “Script error thrown in console when navigating in a Grid having Template”. At Syncfusion, we are committed to fixing all validated defects (subject to technological feasibility and Product Development Life Cycle ) and including the defect fix in our upcoming Volume 2 release which is expected to be rolled out by the end of June, 2020.
You can now track the current status of your request, review the proposed resolution timeline, and contact us for any further inquiries through this link.
Please get back to us if you need further assistance.
Regards,
Renjith Singh Rajendran