Hi WadeH,
In a healthy system OS, it won't cause any issue because of the ability called the backbone area, has a special function as support LSA type 5 as part of its database. Now, the backbone itself does not have any ABRs. The backbone distributes routing information between areas. The backbone is simply another area, so the terminology and rules of areas apply: a routing device that is directly connected to the backbone is an internal router on the backbone.
continue as the definition of ASBR router.
AS Boundary Routers
They advertise externally learned routes throughout the OSPF AS. Depending on the location of the AS boundary router in the network, it can be an ABR, a backbone router, or an internal router (with the exception of stub areas).
ref: https://www.juniper.net/documentation/en_US/junos/topics/topic-map/configuring-ospf-areas.html#id-11658562
I hope this helps! if you think the above info will clear your query please mark as solve!