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bbfa235
(Get the code!)
MAAS uses network probing to determine which interfaces are on which fabrics. Being that the other 3 interfaces are not configured MAAS has no way to determine that they are similar. Saying "It seems exceedingly unlikely that a single rack controller would have interfaces in multiple fabrics and this doesn't make sense as a default assumption." is really based on your experience and others can have different experiences where this is true.
MAAS really doesn't have a better way to solve this problem, other then telling MAAS what it should know.
Only other case I could think of is if those interfaces are also disconnected with no network link at all, in that case MAAS should not create a fabric/vlan for those interfaces.