Do you have the same issue if you follow the OP’s steps to reproduce it?
Yes
Provide extra information to complete the original description of the issue:
Seeing the exact same behaviour as described by OP
Are you using DX11 or DX12?
DX11
Are you using DLSS?
No
If relevant, provide additional screenshots/video:
I first noticed this quite some time ago. I prefer starting most flight ‘cold and dark’ and then heading to the runway after completing all pre-takeoff checklists. However occasionally I’ll make some last minute adjustment to the aircraft or flightplan, hit the ‘fly’ button, and find that it’s dropped me on the runway with all engines running and ready for take-off. Which is a great feature if that’s what you’re after, but very annoying if you’re not!