I have used the same IFTTT applet since 2017 and it has worked fine. But recently it stopped working.
The effect since a week back (or so) is that not only will the color change, but the brightness will be set to 0 and not 50% as in the configuration. I have tried to change it to 60, 80, Do not change, but it makes no difference.
I also tried to use the “Advanced option”, but with the same result.
I did not change anything when it stopped working. I have several IFTTT applets and they all experience the same problem.
My bulb is only of the original LIFX bulbs. It works perfectly well from the phone app.