GLFW Window not initially cleared when ofSetBackgroundAuto() is false (Linux)

I'm doing the following in setup():

ofSetBackgroundAuto(false);
ofBackground(255,255,255);

This does not clear the background to white as it should.

I made a modification to ofAppGLFWWindow::display() which fixed it but I don't exactly understand the cause of this.

The relevant code is:

    if (bClearAuto == false){
        // in accum mode resizing a window is BAD, so we clear on resize events.
        if (nFramesSinceWindowResized < 3){
            ofClear(bgPtr[0]*255,bgPtr[1]*255,bgPtr[2]*255, bgPtr[3]*255);
        }
    }

By changing it to nFramesSinceWindowResized < 5 everything worked as it should.
Is this a driver specific or windowing specific bug? Anyone know why that number is 3 in the first place?

Start at the ofAppGLFWWindow::display() entry point and inspect how nFramesSinceWindowResized controls clearing when bClearAuto is false. Reproduce the setup on Linux and verify that the initial window background becomes white without changing the intended resize behavior.