Why aren't my prefab clones destroying on play mode exit?

Questions & Answers
1

I’m instantiated some clones based off a prefab in my Resources folder when Start() is called in one of my other scripts. It instantiates fine, but when I exit, the clones persist, and if I click play again, they exist in the new run along with the newer clones. This only is happening for one prefab’s clones, my other prefab clones are destroying automatically when I exit play mode.

    private IDable stageMarkerTemplate;

    void SetUpMarkerLines() {
        stageMarkerTemplate = Resources.Load<IDable>("Prefabs/Marker Line");
        float xDist = GlobalVars.horizSize/GlobalVars.horizSecs; 
        for (int i = 1; i < GlobalVars.horizSecs; i++) {
            SegmentHelper.snapLines.Add(new LineRepr(
                -1 * GlobalVars.horizSize/2.0f + xDist * i));
            Instantiate(stageMarkerTemplate,
                        new Vector3(-1 * GlobalVars.horizSize/2.0f + xDist * i + 1.5f,
                                    GlobalVars.markerLineY,
                                    0),
                        Quaternion.Euler(0, 0, 0));
        }
    }

    void Start() {
        ...
        SetUpMarkerLines();
        ...
    }

The stageMarkerTemplate is the prefab that is being cloned. Anyone have any idea why this is happening and how I can change my code to have these clones automatically destroy when play mode is exited?

2

Think I figured it out, Start() is called again when play mode is exited to possibly set up the scene when editing the scene which reinstantiates the marker lines. I avoided the issue by changing my Start() to

void Start() {
     if (Application.isPlaying) {
        SetUpMarkerLines();
     }
}