Same thing happened to me. I replaced my xs max battery and it took 1 hour in apple Düsseldorf. When it arrived, i just inspected the battery status, it’s 100% and I’m happy. After i arrived at home i just realized that my rear camera glass has a small crack. I have ocd and was babying my stuffs since beginning. I was pretty sure it wasn’t my fault so i emailed apple Düsseldorf, explaining the situation and one week later they told me to make a new appointment with the genius guy. They inspected my iphone and surprisingly i got a new xs max replacement (idk if it’s refurbished or not). The reason they gave me is because there is no notes on technician side, it’s considered technician’s fault.
Hope you have the same luck!