No background for applets when installing systemwide with sudo in Linux Mint 22 Cinnamon.

[junglized]

Pretty much as in the title.

Menu applet:

Calendar applet:

It works withouth the issue when installed in ~/.themes folder though.

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Distro: Linux Mint 22 Wilma base: Ubuntu 24.04 noble
Desktop: Cinnamon v: 6.2.9 tk: GTK v: 3.24.41 wm: Muffin v: 6.2.0 vt: 7 dm: LightDM v: 1.30.0
Kernel: 6.8.0-48-generic arch: x86_64 bits: 64 compiler: gcc v: 13.2.0 clocksource: tsc

Thank you 🙂