AFM (Advanced Flight Modeling) has released version 3.0.0 of their M20 Collection. With this update, the plane has officially left its early access state. The devs make clear that they will still bring updates to the aircraft, but feel confident enough to not consider it as early access anymore. The 3.0.0 update is mainly focussed on immersion, according to the developers, and comes with several changes to do so.
This update requires a complete reinstall of the product. A quick guide to do so can be found in their announcement post. The M20 Collection requires X-Plane 11.20 or later, and can be bought from the AFM Store.