Translations:Modding:Developing a Content Mod/22/en
From Vintage Story Wiki
For example, let us assume that 'Asset A' in the 'examplecontentmod' domain wishes to access the default copper texture, which is located at 'block/metal/ingot/copper'. If you put that reference inside Asset A, Vintage Story will change that to "examplecontentmod:block/metal/ingot/copper', which will proceed to not work due to the file not existing in that domain. To counter this, you need to prefix that reference manually with the default game prefix, and place it as "game:block/metal/ingot/copper". This can also be used with other mod domains to use assets from other mods.