I have a metadata schema with one of the fields named “image”. Within that field I have set the default value as “%globals_asset_thumbnail_url%” but when I look at the metadata of the data record I get the following:
Where are you looking at the metadata - View source in the front end, or on the Metadata screen in _admin?
Within _admin, I don’t think the %globals_asset scope exists, so %asset_thumbnail_url% would work but %globals_asset_thumbnail_url% would not.
In the frontend I’d expect them to both work, but I’d probably use %asset_thumbnail_url% for simplicity. I can’t think of a reason to use %globals_ for this.