Apologies for the inconvenience caused to you due to this issue.
Unfortunately we are not able to reproduce this issue. Could you kindly provide the following information to help us nail this down.
When this issue occur please share the AID file with us without closing illustrator.
1) If you are using Adobe Illustrator 2020 , Could you kindly share you AID file with us in a zip file. You would be able to find the AID file in preferences folder in the below location:
MAC: /Users//Library/Preferences/Adobe Illustrator 24 Settings// DataRecovery/ (Kindly press Command + Shift + G and write ~/Library and ok and then go to preferences )
Win: C:\Users\\AppData\Roaming\Adobe\Adobe Illustrator 24 Settings\ \x64\DataRecovery\
Kindly share the above with us in a Zip file at email@example.com. Please mention the title of this issue as the subject of the mail.
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I was able to recover the images by creating a new layer and then dragging the "invisible" images to the new layer by selecting them in the layout, and moving them up using the layers palette. Worked for me.