Some cultivars want to double crop. That trait was isolated and enhanced in Sweetheart. Billed as a double cropper, and now Perpetua is being released.
https://www.gurneys.com/product/perpetua-blueberry
I wonder if these types have secondary latent fruit buds? Or just have the ability to form new fruit buds?
Seems like some conditions bring out this second flowering, or growing buds. I don’t have any rabbiteye. Southerns tend to flower in the fall here, and buds are large. Northerns never do, and buds are small. At least here.