Background is cleared in the first frames with ofSetBackgroundAuto set to false

When background clearing is set to false, background is still cleared for several frames on start.
test case:

#include "ofApp.h" 
bool painted = false;
ofImage image;

void ofApp::setup(){
    ofSetVerticalSync(true);
    ofSetFrameRate(60);
    ofSetBackgroundAuto(false);
    ofDisableAntiAliasing();
    ofDisableDepthTest();

    image.load("/Users/test/image.jpg");
}

void ofApp::update(){
}

void ofApp::draw(){
    if (!painted) {
        image.draw(0, 0);
        painted = true;
    }
}

Start with the supplied ofApp::setup(), update(), and draw() reproduction and trace the startup render loop when ofSetBackgroundAuto(false) is set. Verify that the initial frames preserve the framebuffer rather than clearing it, and confirm the behavior across the affected platforms.