In an MPLS network, OSPF network type mismatch causes routing issues. Router R1 and R2 are connected via a multi-access Ethernet link. R1 has 'interface GigabitEthernet0/0 ip ospf network point-to-point', while R2 has default OSPF network type broadcast. R1 shows 'show ip ospf neighbor' output: 'Neighbor 10.0.0.2, interface address 10.0.0.2, state FULL' but 'show ip route' does not include routes from R2. What is the root cause?