A52s SIM 2 doesn't show "2G only" option

[DannyBoy23]

I have an A52s which I was using with dual SIMs.

This week I received a software update for the phone:

One Ul version: 6.1

Android version: 14

Version: A528BXXU9GXH1/ АБ28ВОХМЭСХН1 /А528BXXU9GXH1

Security patch level:1 August 2024

Now Ihave  noticed that on SIM 2 the "2G only" option in Settings -> Connections -> Mobile Networks -> Network Mode SIM 2 is no longer available. The only options available are 5G/4G/3G/2G or 4G/3G/2G. I used to use this SIM only for calls and although the 2G coverage is good in my area the 4G isn't while 3G is shut down. So now the phone is stuck on 1 bar on 4G and calls are missed or dropped.

Please let me know how to fix this as the phone is unusable now.