Can't load any drivers on Windows 2008 R2, the example project in VS 2019 results in instant BSOD

I'm trying to build the example project from VS 2019:

Then I enabled testsigning and try to load it in Windows 2008 R2, the Virtual Machine immediately crashed.

When I loaded MEMORY.DMP in WinDBG:

EXCEPTION_CODE: (NTSTATUS) 0x80000003 (2147483651) - {

FAULTING_IP: 
test!__security_init_cookie+2d
fffff880`0d16d119 cc              int     3

It's totally weird, the only call to security_init_cookie is from DriverEntry:

Does anyone know what's happening? I didn't attach a debugger, so there's shouldn't be any 0xCC inserted.

0xCC or int 3 is the breakpoint instruction. Debuggers can dynamically insert 0xCC, yes, but that does not mean every occurrence of 0xCC is inserted by the debugger.

In this case, int 3 is indeed part of the code of _security_init_cookie. It means that if you have a security bug and a debugger attached, you'll break into the debugger. If you don't, you have a crash, and for drivers that's an OS crash.