I have a YouTrack item to test with the latest 6.6 RC and 7.0 releases (from this week). It should be fixed, but I haven’t gotten around to testing this yet.
If you don’t want to install newer versions yet you should be able to get things back to their proper versions by dragging&dropping the plug-ins from the install location on a running Rhino 6.5, then close and start Rhino 6.5 again.