CTFd Import v3.5.3

I am trying to import an existing ctfd instance into a clean ctfd (from github v3.5.3 docker compose build). But when I go to import a zip file it hangs there with invalid date and status none.

I have ran through this process on Ubuntu, photonos, lubuntu and all of them are failing.

I have gotten this to work on older versions 3.5.0 and 3.5.1.

Any thoughts on what could be going on?