bubbles inside iPhone X screen

I was planning of changing my iPhone X, screen protector and after removing it. I found some bubbles inside the screen. the bubbles are barely visible. I did not use it in a beach nor used it in a room with high temperature. i checked and read some articles that it might be a manufacturer issue. i brought the phone to a local service center. Ran a series of software test and all was good, but they said that they cannot do anything on the phone and that i should contact the apple support.

did you have any issues like this?