It’s using a new folder name, flybywire-aircraft-a320-neo on experimental version.
MS store:
%localappdata%\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalState\packages\flybywire-aircraft-a320-neo\work
Steam:
%appdata%\Microsoft Flight Simulator\Packages\flybywire-aircraft-a320-neo\work