I've found a problem in the Generic Matter RGBW Light driver, a two-character "typo" leftover from a change I made when testing both some driver changes and a proposal for changes in the underyling Matter code. FWIW, there would indeed have been an error logged for this (a groovy.lang.MissingMethodException).
Other drivers were not affected even though they have similar changes.
This should be fixed in the next build. Thanks for the report!
