They finally got back to me about an ETA for it to be resolved, as expected they don't have one, but here's an excerpt from the e-mail, cutting out the pointless troubleshooting:

this a know issue, it is still under investigation and procedure. We also advise to please report this on the forum as a bug and to stay on the lookout for any update on the Lodestone since unfortunately at the moment we don not have an estimated time of completion. We thank you for understanding this matter and we can only ask for your patience for the time being.

It gives me hope that they said it's "Still under investigation". For now I guess keep spamming them with bug reports.