I also seem to noticed that when Hobbit writing is shown, it often appears to be a different, somewhat, shorter chubbier form of writing than the form most elves seem to prefer. Assuming this is actually the case (as opposed to a flourish by Tolkien or one of the later interpreters) Bilbo might not have recognized them when learning Elvish (again sort of like learning cursive after print, or "casual" Hebrew after the formal kind)
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