Hi Fabian,
3033.2.2 stable was released this week. There are a lot of steps involved in publishing a release (
https://github.com/flatcar-linux/Flatcar/issues/618 for the most recent ones), there's no way to go live in all environments at once so in order to not block the process, there can be a couple of days between when things appear in some places compared to others (cloud marketplaces typically come last).
The json feed update was missed this time, we'll correct that and add some extra checks to make sure it doesn't happen again.
I'm not sure I can name a single canonical source of releases. It really depends on where you consume the update from: cloud marketplaces, directly from our release servers, or mostly as updates.
Bests,
Jeremi