The the Network_Mask (0x12dbc) is wrong, but the ifIPMaskList (0x12dba) is correct.
DX NetOps Spectrum all supported releases.
The Network_Mask (0x12dbc) will not update unless the IP Address ip_address (0x12dbb) updates as well.
Either of the following will update the network mask for interfaces:
1. Change change the ip_address (0x12dbb) of the interface to some other value then run reconfigure model on the device.
2. Delete and discover the device again.