I'm just playing with the TelerikEditor control and I've noticed that if I type or paste some text into the editor and then delete it all, it's leaving behind some HTML.
If just typing text and deleting it, it seems to leave "<p><br></p>" in the bound value.
When pasting in some code from stack overflow I've also seen it leave behind this: "<pre><code><br></code></pre>" - this happens when you paste part of a code block and then a combination of "delete" & "backspace" (I haven't quite figured the order of deleting to get this).
On a separate note, in an ideal world this control would be functionally similar to the other rich text editors in your suite - I'm trying to find one that behaves the same in Blazor (or the Web) and on WPF, as our application runs on different platforms. Yours seem very different to each other.
No rush as for me as I probably won't use it anyway, but I thought I'd mention!