According to theory, this should be affected, because the principle of wireless charging is to generate a magnetic field through the power supply, and then the induction coil in the mobile phone to convert the magnetic into electricity, if there is a magnet sheet, it may complete the magnet sheet heat, there may be problems.
In fact, the phone itself has magnets inside, to achieve some functions, such as wireless charging, will be affected by strong magnets. In addition, the sensors inside the phone, such as the digital compass, will also be affected by the magnet display error. For smaller magnetic magnets (such as magnetic mobile phone brackets), it generally does not affect the function of the mobile phone.
Magnets do affect mobile phones, but they must be very strong magnets to affect some of the functions of the phone.