glfwInit needs to be called twice for shared libraries, why would that be?

Question

Experimenting around I found something interesting let's say we have A.cpp and B.cpp A.cpp in pseudocode is something like this:

// Load library
void (*InitializeRendering)(GLFWwindow*);
    InitializeRendering = (decltype(InitializeRendering)) dlsym(renderer_handle, INIT_RENDERING_FUNC);
    
 glfwInit();
 glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
 auto window = glfwCreateWindow(800, 800, "Vulkan window", nullptr, nullptr);

InitializeRendering(window);

And then B.cpp

extern "C"
{
void InitializeRendering(GLFWwindow* window)
{
    glfwInit();
    
    // Init vulkan surface from window
}

This setup works, what's interesting is, if you delete the call to glfwInit() inside B.cpp things won't work anymore, you very much need to have it initialized in the shared library object. I am wondering why this would be the case? It seems that the global state between the 2 binaries is not shared.