Having the same issue here. This was Squarespace's response,
"Thank you for reporting this. I can confirm this is related to an issue with these internal URLs being flagged as malicious by Google on our end. We’ve reported this to our Engineering team, and they’re currently prioritizing the issue. Please keep in mind that there are many moving parts we need to address before we roll out a solution. We thoroughly test all fixes before they’re released. As a result, we can’t guarantee how long it will take to fix issues like the one affecting your site. Also, because of the volume of reports we receive, we can’t always follow up personally when the issue is resolved. That being said, customer bug reports are an important part of how we continue to improve our platform. If you come across any other unusual behavior, please let us know."
