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Nothing happens on macOS

Hi, I am trying to use glfc on Windows and macOS with NanoVG and OpenGL 3 that is rendering to a framebuffer.

I have converted blur shader to #330 and everything works great on Windows.
On macOS I did set up the correct pixel format for gl3 and everything compiles OK including shaders, and no error is thrown, but can't make it blur the texture. I can see that my GPU is working but it seems that the blurred texture is not painted to the correct destination.

Here is my sample code:

glViewport(0, 0, surface->device_width, surface->device_height);
glClearColor(0.f, 0.f, 0.f, 0.f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);

glGetIntegerv(GL_FRAMEBUFFER_BINDING, &initial_macOS_FBO); // Stash apple FBO

nvgluBindFramebuffer(surface->nvg_surface); // Begin main frame buffer update
nvgBeginFrame(ctx->vg, surface->user_width, surface->user_height, surface->scaling);

///////////
// Drawing something to the framebuffer using the NanoVG
//////////

nvgEndFrame(ctx->vg); // End main frame buffer update

glfc::GaussianBlurFilter filter;
filter.set_sigma(100);
filter.set_blur_radius(100);
filter.Render(surface->nvg_surface->texture, surface->user_width, surface->user_height, surface->scaling);

nvgluBindFramebuffer(nullptr);

nvgBeginFrame(ctx->vg, (float)surface->user_width, (float)surface->user_height, (float)surface->scaling);

NVGpaint img = nvgImagePattern(ctx->vg, 0, 0, (float)surface->user_width, (float)surface->user_height, 0, surface->nvg_surface->image, 1.0f);

nvgSave(ctx->vg);
nvgResetTransform(ctx->vg);
nvgBeginPath(ctx->vg);
nvgRect(ctx->vg, 0, 0, (float)surface->user_width, (float)surface->user_height);
nvgFillPaint(ctx->vg, img);
nvgFill(ctx->vg);
nvgRestore(ctx->vg);

#ifdef OS_MAC
glBindFramebuffer(GL_FRAMEBUFFER, initial_macOS_FBO); // restore apple FBO
#endif
nvgEndFrame(ctx->vg);

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