About this: With the new update, this became a problem again. I also saw this problem in the Cabri G2 (helicopter) thread. A while ago, Asobo introduced a config option to force the modern flight model (regardless of what is set in the menu) but this option is not set in some of the new aircraft…
I created a bug report about this, please consider voting: https://forums.flightsimulator.com/t/modern-fm-only-not-set-in-some-of-the-new-aircraft