The Redmi Note 13 Pro+ 5G boasts an IP68 protection level. However, the phone is not vacuum-sealed and can exchange gases with its surroundings. This means that when the environmental temperature changes rapidly, condensation can occur, leading to fog on the lens.
If you notice water mist on the lens, it should dissipate naturally after a few minutes at room temperature. If you need to use the camera immediately, you can gently warm the lens with your palm or another heat source to speed up the process. If the fog persists for an extended period, please contact the local after-sales service center for assistance.
This phenomenon is similar to glasses fogging up when moving from a cold outdoor environment to a warm indoor one during winter. It is a normal physical occurrence, so there is no need for concern. Thank you for your understanding.