I can replicate this with the C152 and parking brake, though if you apply full nose up Elevator input it stops moving again.
I suspect I had it in the Solo but that thing’s so light it may have been the wind
Not necessarily, its entirely possible to do a static take-off with the Kingair (full power before brake release), not saying you should use the parking brake for that, but that is just bad operating technique, its essentially the same as applying full manual brakes.
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I alos have this on all 3 new prop updates. It seems with the brakes on the propwash is hitting the fuselage and pushing the plane back slightly instead of pulling through the air till it starts to roll just my guess
Havent been able test with the King air
The brakes are not strong enough and it starts to roll forward with full throttle 
All 3 seem to roll backwards at 2/3 throttle while holding the brakes
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This issue has been resolved internally. We will be deploying an updated build to beta testers within the next few days to address this and a few other issues identified by the community. Thanks to everyone who brought this to our attention. You can read the details of the new build here:
https://forums.flightsimulator.com/t/su8-mid-beta-update/498636
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Issue fixed in Sim Update VIII