I try to modify an existing rule that set a bulb HSB value. No matter what value I edit, when I exit the field, it revert back to previous value. I have the same behaviour on mobile and PC, Chrome or Edge.
It seems to be related to switching between "Pick a color" to "Custom HSB" and vice versa. I created a new set color action, setting directly HSB color works fine. If I switch to pick a color then it is the pick a color that reverts back to the previous value.
Yeah, this appears to be a bug in RM. Will get it fixed for the next release.