Well, for me it is still working. But, I have to do this workaround everytime I start the Flightsim.
To explain: when I close my P3Dv4,5-HF3 and restart it, then I need to redo once the workaround via Addon Manager, anyway no matter where I start first ( it works also when clicking the Addon Manager being on a different 3d Part Scenery, not a FSDT-Airport ).