Phase Designation and Feeder Inheritance

How does Phase Designation affect feeder inheritance? In the default configuration of Feeder Manager 2.0, a FeederID is inherited from a connected feature only if the new feature is assigned to an energized phase. Here are some examples:

A three-phase primary connected to a three-phase primary that is energized on any phase does get a FeederID, while a three phase primary connected to a three phase primary that is not energized on any phase does not get a FeederID.
A single-phase primary on A connected to a three-phase primary that is energized on at least A does get a FeederID, while a single-phase primary on A connected to a three phase primary that is not energized on A (even though it may be energized on one or more other phases) does not get a FeederID.
A single-phase primary on B connected to a single-phase primary on A does not get a FeederID regardless of whether the existing A-phase primary is energized. Change the phase value of the new feature from B to A and a correct FeederID is assigned, assuming that the A-phase primary to which you connect is energized on A.
A single-phase primary with no phase designation does not get a FeederID (nor does anything downstream).
A single phase-primary on A connected to a three-phase primary where phase A is not energized does not get a FeederID. This could occur if an upstream device on the three-phase line is open on phase A, or an upstream conductor has A-phase designation from which A is absent.