Thank you for writing.
Indeed, I can confirm that this issue appears. For the time being, I am not able to provide you with a work- around for it. I will log it in PITS and I we will address it in a future release. Here is a link to the item, where you can add your vote for it: http://www.telerik.com/support/pits.aspx#/public/winforms/9897
I have updated your Telerik points for this report.
Meanwhile, what you can do is to use another format for saving your editor content.
I hope this helps. Let us know if you have any other questions.
All the best,
the Telerik team