Bug: Default text preferences (line spacing)

My default text preferences keep disappearing. I’m constantly having to reapply them to the entire manuscript that was created in beta (It has been opened in v3 on my mac.) anytime I open the project. The most noticeable issue is the line spacing. It reverts to single despite my preferences being set to double.

Keep in mind that the formatting options in your screenshot only apply to new documents in your project, not existing ones.

(i.e. you may be encountering a bug, but it also may be unrelated to that window)

I have converted every document to those defaults and saved them. I uploaded the photo mostly to show what my line spacing was set to. I always work in double spaced and this is a favored font and has been used many times.