Thank you for the detailed write-up, this might help me narrowing down the problem
I've checked some vidoes on youtube searching for people with the same issue but sadly all of the youtubers only use the standard close view when going external, so even if they had the same problem they wouldn't know
My hardware is super mainstream. i5 12600k, 5060Ti 16GB, 32GB, with the newest drivers, but I would assume if this would be a problem the issue would appear more under load and less when there's less going on, but it's always at the same ranges and the debug monitor doesn't show anything special when it comes to resources used.
No special settings for MSFS2024 in the NVIDIA applications.
In the sim everything is set to High (other than NPC and airports traffic, but I've also checked rising them to high).
As of now, I have only found one person on the MSFS forums that has reported the same issue.
An exciting mystery to solve, will continue investigating