Class 'ck-widget' is duplicated after saving content more than once

I have been able to duplicate this issue on a site that used a combination of ckeditor_bs_grid and ckeditor_templates. Any template added to a grid where the template included divs—such as adding a Bootstrap card component—resulted in data loss on edit. For some reason, the duplicate ck-widget classes would trigger the removal of the div with col class immediately following the row.

It's an odd enough behavior that I can't quite track down the source. I'm adding a comment in case anyone else is seeing similar.