Xfce panel doesn't change icons of system apps

I installed candy-icon theme on Zorin 16 lite but the xfce panel doesn't change icons of system applications.

Screenshot_2022-08-13_03-03-05

According to this image all icons are changed according to the theme, except terminal, synaptic, thunar.

I tried to change icons with edit launcher menu but nothing happened. So is there any way to change theme of these types of icons?.

The theme that I used.
https://www.gnome-look.org/p/1305251/

Thanks for any kind of help.

I tried the theme to see the problem, but i get the new icon of the theme to terminal app and thunar, but for file synaptic, i also get the the old one.
I go to the folder of the theme, and i didn't found icon for synaptic app, so the default one is displayed
i think u can change icon of synaptic by download suitable icon , but i think u should put it in that path
/usr/share/icons/candy-icons/apps/scalable