Bug: Can't create new Reading Plans on Mac

I have some existing Reading Plans that seem to be working fine, but I just discovered I'm unable to create any new ones successfully on the desktop.

I'll show the full flow through a series of screenshots below.

First I start the reading plan from my preferred Bible:

I'll just take the default options:

It appears to be successful:

I can even see it on my Dashboard:

…and in my Documents:

When I click the Reading Plan from the Dashboard to start reading, it opens up (on another monitor but maybe this is due to a layout?), but the tab in the upper right doesn't show the reading plan itself and that popup ("Your document is synchronizing. Retry sync.") eventually shows up (seems to happen quicker if I click the Notes tab and back to the Reading Plan tab).

If I click Retry Sync, I get the following:

At this point, my Documents now have an "Untitled Reading Plan" and the reading plan I created listed.

After I do a "Close All", however, my documents now only show the "Untitled Reading Plan" which will also disappear once I try and open it and close it again: