The round open C sans serif is a Chinese font normally seen on very bad dollar fakes that were common 15 years ago. The newer and better forgeries use the more correct nearly round C with clear serifs that are almost "closed".
Since the critical element is the mint mark in this case, and most others, I would expect a more polished forger to expect added scrutiny. Forgers who make careless errors are targeting a less knowledgeable audience of buyers.
This $20 coin falls in that category - it is like some of the earlier round sans serif coins. Completely wrong.
Here is a picture of some good and bad CC fonts with the $20 coin included.
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