When it comes to things that shouldn't be photographed with a digital camera, "strong light" (related article). So-called "sensor burn" is almost not a problem with flashes of light aimed at backlighting or flaring, but if the same spot is exposed to strong light for a long period of time, it will lead to deterioration of the image sensor. Mirrorless single-lens reflex cameras are said to be particularly susceptible to sensor burn. Mirrorless cameras do not have a reflector (mirror), and the light that enters the image sensor is reflected on the viewfinder and monitor, so the time the light hits the image sensor tends to be longer. The image sensor may be exposed to outside light even when the power is off, so the lens cap prevents the sensor from burning. And sunlight isn't the only cause of sensor burn. For example, "laser beam". Using a digital camera to capture the laser beams used at concerts and other events may cause sensor burnout.
"Laser beam" is the cause of sensor burns YouTube has several videos that capture the phenomenon of sensor burns caused by laser beams. When you see how the laser beams flying around the concert venue, which are brightly colored at first, change to strange colors over time, you should be able to feel the horror of sensor burn. If you are interested, search YouTube with phrases such as "laser sensor kill".