That definitely seems like an actual bug then. ix-apps should exist after migrating to 24.10 (that’s where your apps dataset is stored after migration) but it should be a hidden dataset. It being visible in 24.04 means something unexpected happened.
I suggest you submit a bug report explaining what you did and what you observed either through the UI or with the report a bug link at the top of this page, attach a debug file to it, and then give me the link to the ticket.
Yes they’re all visible to us via private upload links. Engineering is requesting that you try upgrading back to 24.10 or the new 25.04.0 that just released today and capture a new debug as well, if possible.