I understand that the problem of finding these albums and replacing them automatically is very difficult. At least users can re-search and add them again if they find them missing, though it’s not ideal.
However, metadata edits are lost on the unavailable album and one has to redo them on the new one, which is a lot of work and probably impossible for many people. This kind of defeats the whole Roon feature of allowing edits of streaming content - a really good and important one. This problem at least could be solved by allowing users to copy their metadata edits from one album to another, which would also be handy in many other cases (e.g., change of preferred version - although for this it seems a neater solution if edits were applied to the master and not individual versions, at least optionally to still allow for version differences)