I had this reply form the developers today
Hi,
Thanks for reaching out and for letting us know about this issue.
We have contacted Apple to request their assistance in resolving this. Unfortunately, we are unable to tell how long it will take, so we apologize in advance for the inconvenience.
While we are working on a permanent solution, there is a temporary one that have been reported to work by some users. You may try it by following the steps on this page: https://secret-calculator.com/offload.html
Hope this solves your issue for now. Regardless of the outcome, please make sure to not delete the app, as that will also permanently delete your documents.
Best,
One Wave