Xiaomi Philips Zhirui Mijia Downlight Wifi Lamp 9290012799

I have the problem that i can’t to dim Brightness and Correlated Color Temperature channel of my XIAOMI Phillips Zhirui Downlight Lamps.
Power ON/OFF and Toggle swithes are worked.
Does anyone know? How to manage this?

I use:

In bindind page example of .items:

Group G_light "Xiaomi Philips Downlight" <status>
Switch power "Power" (G_light) {channel="miio:basic:light:power"}
Number brightness "Brightness" (G_light) {channel="miio:basic:light:brightness"}
Number cct "Correlated Color Temperature" (G_light) {channel="miio:basic:light:cct"}
Number scene "Scene" (G_light) {channel="miio:basic:light:scene"}
Number dv "DV" (G_light) {channel="miio:basic:light:dv"}
Switch switchscene "Switch Scene" (G_light) {channel="miio:basic:light:switchscene"}
Switch delayoff "Delay Off" (G_light) {channel="miio:basic:light:delayoff"}
Switch toggle "Toggle" (G_light) {channel="miio:basic:light:toggle"}

I try to change “Number” to “Dimmer”:

Group G_light "Xiaomi Philips Downlight" <status>
Switch power "Power" (G_light) {channel="miio:basic:light:power"}
Dimmerbrightness "Brightness" (G_light) {channel="miio:basic:light:brightness"}
Dimmercct "Correlated Color Temperature" (G_light) {channel="miio:basic:light:cct"}
Number scene "Scene" (G_light) {channel="miio:basic:light:scene"}
Number dv "DV" (G_light) {channel="miio:basic:light:dv"}
Switch switchscene "Switch Scene" (G_light) {channel="miio:basic:light:switchscene"}
Switch delayoff "Delay Off" (G_light) {channel="miio:basic:light:delayoff"}
Switch toggle "Toggle" (G_light) {channel="miio:basic:light:toggle"}

And no change.

BUT! Two times out of 100 dimmer changes - some changes have occurred!

OS: Debian
openjdk version “1.8.0_171”
OpenJDK Runtime Environment (build 1.8.0_171-8u171-b11-1~bpo8+1-b11)
OpenJDK Client VM (build 25.171-b11, mixed mode)