The screen on mac to mac shifted up

When using mac to mac mode, the secondary screen is shifted up, the top menu bar is hidden as a result and the bottom part of the screen is forever blank

the primary mac is MBP 2018 and the secondary screen is MBA 2012 mid

Try installing the beta (v. 4.0.3):
http://astro-hq.com/luna-next/

That worked for me.
Steve Haney pointed out the solution here:

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