Based on them, I tried to reproduce the issue you are experiencing in this Dojo example. You can see that after pressing the SaveChanges button, the new value of the checkbox is saved instead of the original one. Could you please modify the example to replicate the problem? I will then test it and happily assist you.
Looking forward to your reply.
Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.