Metaball settings for new metaballs is not copied from the existing basis so that they are kept in sync.
However, they can still go out of sync because of object renaming. But that problem I can fix when D4398 is merged.
Committed alternate fix to this rBb2889c7cf122a5bc6b028470c3c3800637e780ab
Will reply to D4398 with some more details.