Google assistant does not let me change color of my yeelights

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Hi there,

I used this instruction to connect my HA with google assistant:

And it works great with my yeelight bulbs (colored bulb, bedside lamp, ceiling 650 and desk lamp).
The only issue I have is, that there is no way to change the bulbs color. I can only turn it on/off and set the brightness. But I can’t change the color:

Screenshot_20190517-123555_Home
Screenshot_20190517-123555_Home1080×2220 229 KB

I also use haaska to connect my HA to alexa and there I can change the color without any issue:

Screenshot_20190517-124120_Amazon%20Alexa
Screenshot_20190517-124120_Amazon%20Alexa1080×2118 353 KB

Is that an issue of the google assistant implementation of home assistant or do I need to set something, in order to tell google assistant, that this is a color bulb?

Thanks in advance!