This definitely seems odd since it only occurs in preview and not present. Can you please reach out to the support team directly via this form for help: https://help.figma.com/hc/en-us/requests/new
Be sure to use your Figma account email, include the links to your file, and share it with support-share@figma.com so they can take a closer look.
Unfortunately I’m not allowed to share the file from management (we have strict ISO norms). I’ve tried to reproduce it in a new file, but it works fine now. I’ll try to isolate/reproduce it if I run into the problem again.
Would it make more sense if it was also not visible in Preview? I know the elements have to be within the frame, a common mistake, if that was what you were thinking (but you can see in the video, they are). Or is there something else that could cause it not to show?