Thanks for testing and your feedback - short update on this:
I could fix the issue with the “helicopter-fix” by switching back to Legacy-Flightmodel (flight with DA62 is loading) and then back to Modern Flightmodel. DA62 is loading again 
Thanks for testing and your feedback - short update on this:
I could fix the issue with the “helicopter-fix” by switching back to Legacy-Flightmodel (flight with DA62 is loading) and then back to Modern Flightmodel. DA62 is loading again