Addon not working other than youtube

[Sabike-Raja]

Describe the bug
When we give an addon URL other than the youtube URL, I can able to see the iframe. My issue is I will save the editor value, when I try to show the saved data in the editor, in that time I can't see the iframe. it shows the blank space there

when I save the editor it shows with the iframe

but when I try to open the editor with saved data it shows like this

It should show like in the first image right. correct me if I am wrong