Already documented via a Feedback bug request - but it seems this issue has reared its ugly head again after a few years (and a few iOS updates).
After a recent update to iOS 27.0.1, I noticed some quirks in the Music app regarding older purchased albums in the library not being treated as purchases (i.e. the metadata in the album currently for sale differs from the metadata from the original time of purchase, thus the "Show Complete Album" / "Buy via iTunes Store" messages at the bottom of the page) - this seemed to introduce a bug where the "Only Remove Downloads" option was missing (and in some cases, the download arrow button had no action whatsoever). Assumed this was some caching issue occurring following the update from iOS 26, and signed out from (and back into) Media & Purchases as suggested.
However, it seems that by doing such, those of us with large purchase libraries (the equivalent of music > 300 GB, movies > 2 TB, audiobooks > 500 GB, on average) are not making the necessary connections to the Media Services server again for relative apps (Music, TV, Books) to recognize that these purchases exist, i.e. no cloud icon on albums/audiobooks, video purchases missing, etc.
This last occurred (personally) at some point during the transition from either iOS 16-to-iOS 17 or iOS 17-to-iOS 18, where it was months before something triggered on the server end to remount purchases in the library.
Anyone else (with terribly large purchase libraries) have any hints/tricks to nudge iOS 27 devices to contact the servers to remount purchases, or is this (once again) a "wait for Apple to address feedback" issue to validate server connections?
Thanks.