We used MultiCompositeField custom xytpe [structure is in screenshot.]
On rollout the nodes are having cq:LiveRelationship jcr:mixinType
Now when we break the inheritance and then edited this node from live copy dialog then nodes are recreated, so the property cq:LiveRelationship no more exists.
Impact is if we again Rollout from master then these nodes are updated.
Actual behavior should be that cq:LiveRelationship should exist as for othe OOB xtype
Any issue by using similar custom xtype MultiCompositeField. Any check we have to make in custom xtype for live sync.
MultiCompositeField is modification of OOB MultiField