Both routers can accept both default routes and stores into OSPF database("sh ip os da"). If the existing static default route is not there, then the learned OSPF default route comes into route table. I can recommend other configuration use "default-information originate route-map test". I am giving one example from Core A aspect....
route-map test permit 10
match ip address 1
match ip next-hop 2
access-list 1 permit 0.0.0.0
access-list 2 permit
So that, Core A advertises default route to Core B, only if it is having connectivity to edge A.
Or in other way, assuming that you are advertising core-B and edge-B connected network to Core-A. Now, if core-B and edge-B network fails, then this network dropped from Core-B to Core-A. The following configuration at Core-A checks for that one and Core-A advertises the default route if Core-B and edge-B network is down.
route-map test1 permit 10
match ip address
match ip next-hop
I strongly believe that the above configuration might work. Because when Core-B withdraws the route, then Core-A matches that network with it's existing static default route pointed to edge-A.
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