The attached images show how Bosch supply injectors with a copper washers. When fitting into engines with copper injector sleeves the washer is clearly not required. However people with limited product knowledge often make the mistake of fitting supplied copper washers. As you can see in the attached images, it makes a considerable difference to the position of the injector nozzle. This was the point that I was trying to make in my post.
I have been remanufacturing Volvo engines for 39 years now, and this is not a uncommon occurrence when people change injectors.