What is to be considered in the event of an absentia divorce being issued against the wife without her knowledge, and then she filed for khul' and a judgment was issued for it, and the wife was later surprised by the issuance of the absentia divorce judgment against her?

If a husband divorces his wife before khulʿ (divorce at the instance of the wife), his divorce is effective, whether the wife knows of it or not. If the divorce was an irrevocable (bāʾin) divorce, then the khulʿ after it is void. If it was a revocable (rajʿī) divorce and the khulʿ occurred during the ʿiddah (waiting period), then there is a difference of opinion regarding its validity.