RefinableStrings managed properties are assigned to crawl properties only at the site level

I accessed the managed properties at a site level scope inside SharePoint online, and I found some refinable strings assign to crawl properties, but when I accessed the same refinable strings at the tenant level i found that those managed properties do not have crawl properties assign to them, here is a example for RefinableString06:-

1. Site level

1. Tenant Level

Also the confusing issue is that inside the UI the ability to assign crawl properties to those managed properties are disabled on the site level, so how those got assigned?