If you under the open graphics stack, you will find out that only 60hz are available.
Try the 5.16.2-1, see how your monitor reacts to it. Linux Kernel 5.16.2-1 came to me via the official update channels. It was part of a large update package, of 156 packages (for my computer and apps) which upgraded Manjaro to 21.2.2 and the kernel to 5.16.2-1, updated set of drivers. The sound from my sound card improved, it came with its own version of NVidia drivers 470.xx as production/enterprise drivers (i am running a quadro video card on a production Workstation) with it and the 495.xx as feature drivers. I believe the 470.xx will get your monitor working, being the polished tested to be reliable and stable driver.
I have an Intel Iris Xe GPU, first monitor with 3840x2160 at 144Hz continues to run without problems with 5.16. Nothing to repair.
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Kernel v5.16.2 was released to Manjaro stable branch yesterday
[Stable Update] 2022-01-23 - OpenSearch, Kernels, KDE Software, Cinnamon, Pipewire, Mesa, Gnome, LibreOffice