I'm sorry for misleading you in my previous post. It seems that I tested using a version of the Telerik.Web.UI
suite, different than the official one. Indeed, we isolated the bug and we are working on fixing it. Let me know if you'd like an earlier fix and I will send it to you once ready (for a developer version, please, open a formal support ticket).
P.S. Your Telerik account is updated.
the Telerik team