CKeditor 5 image upload popup does not open

I had post it twice as I don’t know if it ckeditor 5 issue or responsive image module issue.

Thanks.

It should be possible for you to determine that.

I have test ckeditor 5 without responsive image module installed and the problem exist too. So I think that it is native ckeditor issue or misconfigured. When someone click on image icon what must be shown?

Would you please validate the bug on https://simplytest.me/ and list the steps to reproduce?