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Fasciation has many causes both internal and external. Internally, it happens because of a hormonal imbalance in the growth cells, a bacterial or viral infection, or a random genetic mutation. There are also environmental causes, like chemical exposure, cold and frost exposure, or fungi, mite, and insect attacks.
https://hackaday.com/2021/04/22/the-fascinating-world-of-fasciation/
Looks like a case of fasciation!