reinstalled ZorinAppearance with your kindly sended commands. Rebooted afterwards. Problem resists within Zorin Appearance and here is the output of the appearance package list seem to be still the same:
sudo apt list -i | grep appearance
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
zorin-appearance-layouts-shell-core/noble,noble,now 4.5.4 all [Installiert,automatisch]
zorin-appearance-layouts-shell-premium/noble,noble,now 5.1.2 all [Installiert,automatisch]
zorin-appearance-layouts-support/noble,noble,now 3.5.6 all [Installiert,automatisch]
zorin-appearance/noble,noble,now 5.5.3 all [Installiert,automatisch]