Delta time/per-tick operations in Immediate Mode

Using Immediate Mode, I observed that DrawShapes(Camera cam) will be called multiple times each render in-editor, once for each Game and Scene window. This can result in any per-frame/time operations having different results in editor versus builds.

A simple fix for this can include modifying your logic if the camera is not the primary camera. For example:

public override void DrawShapes(Camera camera)
{
  float delta = Time.deltaTime;

#if UNITY_EDITOR
  if (camera != Camera.main)
  {
    delta = 0f;
  }
#endif

...