Looks like the government deregulated the transgenic american chestnut. I initially supported the original Darling 58 trees, but the whole thing became a fiasco with a mix up. These are Darling 54 trees now and they don’t have the vigor the D58 or regular trees had.
https://www.aphis.usda.gov/news/program-update/usda-deregulates-american-chestnut-engineered-enhanced-blight-tolerance