iPhone 11 magsafe compatible?

About two months ago I had purchased a MagSafe charger and I noticed that if I take the case off my phone,the charge sticks to the back of it. At first I thought that it might be due to the magnetic field created between the two copper coils but I turned off my phone completely and I had also cut the power for the MagSafe charger.Long story short,it still sticks. I do have to mention that my iPhone 11 was purchased post iPhone 12 launch (with the new design for the box and everything).

Might it have some kind of magnet’s placed inside?

PS:I also tried this experiment with an iPhone SE 2 and an iPhone XR,and they both failed.