In the latest announce for 6.22/06, Axel wrote:
The previous patch release 6.22/04 was not announced due to a fatal issue in the I/O subsystem discovered right after tagging. Please don’t use it, but move directly to 6.22/06.
Our team and me have already processed some data with 22/04 so we are wondering what’s the IO issue you’ve been talking about, @Axel? Currently it’s a bit unclear for us should we reprocess our data or not. Some details about that IO issue could hopefully clarify the point.