CloudMirror sample and CustomStateProvider lifetime.

I want to implement a custom version of the separate COM exe server with lifetime management and ref counting of handlers (https://docs.microsoft.com/en-us/windows/win32/com/out-of-process-server-implementation-helpers).

I have added a debug output into constructors and destructors of handlers to inspect their lifetime.

static std::atomic<int> instanceCounter;

CustomStateProvider::CustomStateProvider()
{
    OutputDebugString((L"CustomStateProvider constructor called (instance counter: " + std::to_wstring(++instanceCounter) + L")\n").c_str());
}

CustomStateProvider::~CustomStateProvider()
{
    OutputDebugString((L"CustomStateProvider destructor called (instance counter: " + std::to_wstring(--instanceCounter) + L")\n").c_str());
}

For some reason, the CustomStateProvider constructor gets called more times than its destructor. Even if I close all explorer instances and finish the application. Is this a bug in SDK?

CustomStateProvider constructor called (instance counter: 1)
CustomStateProvider constructor called (instance counter: 2)
CustomStateProvider destructor called (instance counter: 1)          <-- last time CustomStateProvider destructor gets called
TestExplorerCommandHandler constructor called (instance counter: 1)
TestExplorerCommandHandler destructor called (instance counter: 0)
TestExplorerCommandHandler constructor called (instance counter: 1)
TestExplorerCommandHandler destructor called (instance counter: 0)
TestExplorerCommandHandler constructor called (instance counter: 1)
TestExplorerCommandHandler destructor called (instance counter: 0)
ThumbnailProvider constructor called (instance counter: 1)
ThumbnailProvider destructor called (instance counter: 0)
ThumbnailProvider constructor called (instance counter: 1)
ThumbnailProvider destructor called (instance counter: 0)
ThumbnailProvider constructor called (instance counter: 1)
ThumbnailProvider destructor called (instance counter: 0)
ThumbnailProvider constructor called (instance counter: 1)
ThumbnailProvider destructor called (instance counter: 0)
ThumbnailProvider constructor called (instance counter: 1)
ThumbnailProvider destructor called (instance counter: 0)

Start with the CloudMirror sample and its CustomStateProvider entry point, then compare the logged constructor and destructor counts with the COM out-of-process server lifetime guidance linked in the issue. Determine whether the unmatched instance reflects a sample or SDK lifetime problem, and document the verified ownership behavior or a reproducible correction.