As said earlier the
interworking.realms-raw
only happens to "come out" on 7.22 or 7.22.1, but it is not clear what "triggers" it.
I don't think that it is a "generalized" issue (otherwise by now we would have had tens or hundreds of reports, given the ubiquity of iPhones, particularly in the US but also in many EU countries), it must be happening only in some cases when the update is performed (and the use of Winbox v3 might or might not be the cause, it could be some wifi or non-wifi related setting that is causing it during the "translation" of the configuration from an earlier version).