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Ah sorry, I somehow missed that error. Seems to be something funky with the types of useFieldArray which detect the array keys in the Control. They use a lot of recursive conditional types internally, and I can't figure out why adding an extra conditional type would make it do the right thing. I tried looking for a similar issue at https://github.com/react-hook-form/react-hook-form/issues/ but couldn't find anything. You should consider creating one if you can't figure it out.