I have a (selfmade) theme called “Name & Name” in style.css:
// Theme Name: Company Name & Name
When I do a site scan with Cerber, it lists the theme by the correct name and attaches the “No integrity data” label as expected.
When I now click on “Resolve issue”, the dialog opens and it says:
We have not found any integrity data to verify Name & Name v. 0.0.79.
When uploading the .zip with the original theme data, it errors out with:
Error: file name_name_theme.zip cannot be used. No files in the uploaded archive contain a valid plugin name. Please upload another file.
Removing the Ampersand from both the installed and uploaded theme solves the issue.
So it looks like an entity decoding problem.