IKEA tradfri color change sets full brightness thru Nabu Casa

Hi!

If I change color on my IKEA Tradfri RGB lamp from either voice command or directly from my Google Home app the brightness always goes to 100%.
Changing the color from HA is not giving me this issue.

I’m using RPi 4 with Hass.io and Nabu Casa to integrate with Google Home.
It’s only my RGB light that has this issue, changing color temperature on another light works as expected.

Any advice on where to start?