Several months back I had an Iron condor in QQQ. One morning I suddenly found IB had sold stock and I was short QQQ stock. What would have happened if instead of QQQ there was an cash settled index? Thanks for guidance.
I assume you saying you were early assigned on an ITM call. If you are trading a Cash indexes that allow early exercise, you would have no position the next morning on that leg. Most don't allow it. So just stick to those.