I didn’t find home page for this plugin, so I had to create a new topic.
The problem is that the indication for modifiers works only after layer switching (via Fn or NumLock). It does not work when you turn on the computer for the first time or after flashing the keyboard.
The firmware was compiled based on the example “Model01-Firmware”. The plugin is activated last in the list (KALEIDOSCOPE_INIT_PLUGINS section).