60C on a 9900X3D at idle is way too high. It’s not a critical temperature, but it should be much lower. When I had mine, it idled around 40C and I only hit 60 C while playing MSFS, so clearly something isn’t right.
The hotter version, my new CPU 9850X3D, is what I’m looking at now, and with a dozen tabs open, it’s sitting at 42 C.
If you don’t want to upgrade your CPU cooling to a better 360 or 420 AIO, you could ask for help on lowering your CPU temperatures in the thread linked below - someone there will surely be able to assist.
https://forums.flightsimulator.com/t/optimizing-bios-for-msfs-2020-2024-tips-advice-and-discussion/756831