Where does iconize store info about icon packs?

[Igorgro]

I noticed the following thing: simply copying icon to .obsidian/icons/ folder does not make it available in the corresponding icon pack. Meanwhile adding it from settings interface from another location results in that icon being copied to the .obsidian/icons/ folder. After that it becomes available as the named icon in notes. Moreover if the icon is deleted from .obisidian/icons folder (while keeping original icon which was imported) and using icon name in note results in icon being restored. I tried to track changes using git and noticed that nothing is changed when adding icon to the icon pack (except obviously copying icon file to .obsidian/icons). All this means that iconize plugin stores info about installed icon packs somewhere outside of the vault. My question is the following: where does it stores this info exactly?