The OSPF network type loopback is enabled by default for loopback interfaces, it can also only be used on loopback interfaces.
The network type of loopback will always advertise the host address of the loopback into the network, and not the network itself, even if not configured with a 255.255.255.255 subnet.
Changing the loopback to a point-to-point network type will allow the entire subnet to be advertised into OSPF.
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