I have noticed that when using a Philips Hue bridge I can only dim to minimum in Home Assistant when using the slider when selecting af Philips Hue bulb. It does not turn off the light.
When using zigbee2mqtt the light turns off when going to minimum with the slider.
Also I can see that when sending the value 1 to a Hue bulb it turns off with zigbee2mqtt. When using Hue bridge it does not turn off with the value 1.