It's not unstable and I know it, I redid my OC after the game was running and just played for like an hour and a half with 0 issue, the game doesn't even max out my GPU utilization or its clock speed.
It's perfectly possible your OC wasn't the cause of the issue, but you are far too confident in your testing methodology. The easiest way to rule out an overclock being the culprit is to revert the part to stock. You can never completely prove stability, only demonstrate instability, but stock speeds are a good baseline and a way to avoid tangents like this.
What driver version are you using, btw? 21.4.1 and 21.5.1 made significant changes to the software and still have some issues. They also rendered many previously stable OCs unstable.
You do realize that a stress test is performed to make sure a system or OC is STABLE right? it puts your GPU under max load.... if there was going to be instabilities it would have shown there.
Not all loads stress the same components the same ways and no single test, or small selection of tests, will identify all instabilities. It's also possible for a load to be too high to be useful if it's power or temperature limited because this will cause a reduction in clock speed, potentially hiding issues that would reveal themselves under less demanding loads.
But the fact really is, if it were an instability the GPU driver would crash, my PC would freeze untill the driver restarted itself, that is not what happend.
Not necessarily. The app itself could crash, you could see display corruption/artifacting, a performance reduction, or any of a number of phenomena short of a driver crash, lockup, or restart.