Microsoft does different things in different regions and different things in different versions of Windows. Even for the same version in the same region, they may be running an A/B test on you.

(It also may depend on exactly how you’ve set up your bootloader – EFI or MBR, whether it’s on the same physical drive as the Windows partition or not, etc.)

But just because it hasn’t happened to you doesn’t mean that it hasn’t happened to others.