Is it a product quality issue if there are holes that are leaking light in the cavity of the Xiaomi Microwave Oven? Will it cause microwave leakage?

The holes do not affect the normal use of the Xiaomi Microwave Oven.
For your reference, here are the functions of the holes:
1. These holes serve specific purposes and are intentionally designed as part of the microwave's construction. Ventilation holes in the cavity are designed to allow for proper airflow and prevent the buildup of heat during operation. This helps keep the interior dry and reduces the risk of mold or unpleasant odors;
2. These holes only allow light and air to go through. Microwave ovens are designed with specific safety standards to prevent microwave radiation from leaking out of the oven. Please feel free to use it.