2019 Lowell earring

http://cuds-on-coins.com/interior-die-break-america-the-beautiful-reverse-quarter/

Yes it is listed here, and an earlier die stage is also depicted matching the "half-circle" you found. Looks like it did form from a circular die crack, an anomaly that strangely enough seems to be occurring in the central part of the die on some modern coins.

 

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