Thank you for your report. We have introduced this bug between Internal Builds 10.29 and 11.06 and it is present in all internal builds after that. We will do our best to fix it for next internal build and the fix will be definitely included in the Service pack. For now you can use the official Q3 (10.17) build. Note that the Internal builds are made more as a reference where you can check if an issue is fixed and not for production.
All the best,
the Telerik team