Indeed, after v7.2.7, the mobile service has undergone some quite big changes. Some options have not been added back yet, and some may not return at all.
I would recommend migrating the scripts to use ubus, as all of these options are available there. E.g. IPv4 address of the mobile interface can be found by running the command ubus call network.interface.mob1s1a1_4 status and IPv6 address - ubus call network.interface.mob1s1a1_6 status.
Service uqmi also offers quite a bit of information for the mobile connection values.
Let me know if any additional information is needed!