Kirby-color-palette - Dont work with Conditional fields (when:)

Hello, I would like to use the plugin as an alternative tab in the layout settings. For this I would like to use the Kirby Field Conditional “when:”.

It does not work to reference this field via another field (when :).

Example and more Information at git:

Help me please! :slightly_smiling_face:

Ps: sorry for my bad English.
Unter dem Link findet ihr meine Deutsche Fehlerbeschreibung