I just checked the version control, but I haven't changed the file responsible for that list in v4.8.4, it should be the same in al 4.8.x versions so far.
Maybe on the other site the custom fields are created on the main site as well? As far as I know on multisite installations the custom fields are not shared, they are unique for each blog. ( I might be wrong though, I'm not sure )Best,
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