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Users can suggest tags with spaces (but the suggestion can't be approved)
See this suggested edit, where the user suggested adding the tag "American English". Due to it having a space, I am unable to approve the edit, getting the message
Tags may not include spaces or underscores
Note: I changed the tag from "American English" to "American-English" to try to get it approved, but it still rejects it.
Even if that workaround had worked, though, this should still have been caught at the suggestion stage.