Many people were reporting this bug, then they put it on the known issues list September 2nd, but haven’t touched it for the last 3 updates.
https://forums.flightsimulator.com/t/xbox-one-controller-z-axis-lt-rt-rudder-not-recognized/131158
https://forums.flightsimulator.com/t/why-is-rudder-control-all-or-nothing/211918
I figured adding it to “known issues” meant they were working on it. Two months later, maybe not.