@Michael ********
Cannot say for sure, as they give a 15 day under consideration stamp first. But here is the basic rule: If it is your first covid extension, they will start the 60 days at the day of application (so you will lose days when going early). Subsequent covid extensions will be added at the end date of the former one then. Not makes sense. It is what it is. And some immigration offices do things their inconsistent way. We just have to endure that.