It relates to the food you try heating. When trying to cook thick pieces of food, it is hard for the microwave to penetrate. It is recommended to cut the food into small pieces before microwave cooking.
Note:
For better cooking results, you can keep an eye on the cooking progress of the food and adjust the time according to your taste preference to prevent overheating. Besides, you can open the oven door, flip the food, and close the door to continue cooking when halfway through cooking.