For recent musicbrainz additions I do no longer get a match in Roon. I cannot really identify a pattern - even so quite a few of the additions were made near to or after the latest musicbrainz schema change (mid-May, see https://blog.metabrainz.org/2019/05/13/musicbrainz-schema-change-release-2019-05-13-with-upgrade-instructions/).
Is this just coincidence or is something (else) going on?
This album was added to musicbrainz on 2019-05-19:
Previously that would have shown up in Roon after two to three days - but it doesn’t now.