sergioravazzoni , via OnePlus 9 Pro , Jan 23, 2022 : Please it is confirmed that 5G works only in SIM 2 , and this is a big of C44 ? In Android 11 5G work on both SIMs !!! Please OnePlus staff answer to this question !
fawnsy , via OnePlus 9 Pro , Jan 23, 2022 : After I upgraded I can no longer get 5g even though the option is selected
Aaron2017 , Jan 23, 2022 : You will not get a answer from OnePlus staff here as this is a user forum. I would imagine that this is a bug though, you should have 5g in sim 1 as well. You can send feedback about it here if you want https://forums.oneplus.com/feedback/ And you can contact support about it too to see what they have to say about it
sergioravazzoni , via OnePlus 9 Pro , Jan 23, 2022 : Sent feedback to OnePlus with the opening of a ticket for the bug
V1536133760041 , Jan 27, 2022 : Confirmed. Just moved simcard form slot 1 to slot 2, now I have 5g again. OP9 C44.