It works.
I used it to recompile my latest, "PeabodySimple" mission. Editor runs to completion without problems, and the resulting new mission version flies as expected using the current game software. Version 2.21.3 in both cases.
This is a very simple mission without warp points. My next test will be with my big, ugly "Hollandia" mission, which uses several warp points and will stress everything much harder.
Regards,