CanvasGroup.alpha hides the UI in Scene view but not in game view.

I was trying to make a strip of buttons, and wanted to use the canvasgroup’s alpha to disable it. however even though in scene view works fine when playing, it does not in game view. Here’s what happens:

This is basically what i’m doing, nothing too complicated:

    void ShowMenuStrip()
        _menuCanvas.interactable = true;
        _menuCanvas.blocksRaycasts = true;
        _menuCanvas.alpha = 1.0f;

    void HideMenuStrip()
        _menuCanvas.interactable = false;
        _menuCanvas.blocksRaycasts = false;
        _menuCanvas.alpha = 0.0f;

Am i missing something?

The game view does not show the background. Is there anything clearing the frame buffer, any camera with clear flags background or skybox? since the scene is otherwise empty it looks like the buttons would be invisible, but are still on the frame.