Following up, over 2 days have passed since opening my ticket with SquareSpace support (after waiting 72 hours for DNS), and I have not received a single reply.

I've edited DNS records for multiple domains that have not propagated at all.

As far as I can tell, it looks like there are major system-wide issues with SquareSpace domain's DNS records propagation. Doesn't seem like it works at all.

Can ANYONE in this thread confirm they've have DNS records propagate correctly after a domain was transferred from Google -> SquareSpace?