Sounds similar to my issue from here: Elixir: Infinite Loop when running Config.Provider? - #14 by ksluszniak. There too @mhostetler was relating the issue to doing deployment via Github Actions, and so was I. Then the app “fixed itself” either because I’ve done a local fly deploy or for whatever other reason just healing itself.
I’ve done many deploys afterwards via the same workflow in Github Actions and no such issue returned, although in last 2 days that workflow often errored out or hanged for hours even though the deployment was successful. Considering that I faced no such issues on local fly deploy this may be CI-specific but there’s no hard proof for that…