埋め込み画像を解除すると「不明なエラー」で解除できません。

Hi there,

Thanks for reaching out. I tried to replicate this process on macOS as well as on Windows but I could not. 
Would you please elaborate the process you are following? You may also attach the screenshots or a small video with your post, it will help us understand your issue better.

Looking forward to your response.

Regards,

Ashutosh