My TV does something similar. Best/worst example is if I display a black console with a blinking white cursor: the backlight flashes on and off from min to max

My TV does something similar. Best/worst example is if I display a black console with a blinking white cursor: the backlight flashes on and off from min to max brightness in time with the cursor. It is an abomination, a gimmick whose only purpose is to cheat at contrast ratings. If I ever meet the engineer who came up with this BS, I will stab them with a strobe light.