Site-editor is no longer appearing

Dear support, Before site-editor (identity) was working, so I could change my site-logo. Now site-editor won't open anymore so I can't change my favicon. It may be since updated wordpress. I tried to add my logo on the block-editor. It appears on my web but not as favicon. Can't enter site-identity anymore. I also tried to deactivate all my plugins but without succes. I hope you can help me out.