Fault tree generator ignores fault contributors when encountering a trace cycle in HW

[reteprelief]

The backward trace algorithm keeps track of propagation graph nodes that have been visited.
When encountering such a situation on one path it ignores additional propagation paths.
Example: SafetyTutorial under Examples on github/osate.
The system implementation GPS.Dual does not show the complete set of contributors - ignoring part of the second input to the voter. This occurs on a connection with HW propagation path, which has a propagation cycle in the HW side and skips the propagation to the connection source.