This bug was introduced with the xbox release so about 5 months going strong. There was a main thread about it with more votes that I can’t find now.
Anyway if you search the forums for “cursor” you can see hundreds of people frustrated by this bug going back to that xbox release. Devs have, typically, never responded to anything related to this bug. It’s kinda like the multiplayer bug which took 3 months for them to acknowledge and another half a year to fix.
Edit: the main thread is here so vote there please https://forums.flightsimulator.com/t/bug-logged-freelook-with-mouse-causes-controls-to-freeze-after-su5