I have updated this ticket: https://github.com/primefaces/primereact/issues/2547

I think there needs to be showcase example on how to use InputNumber with React Hook Forms if it is not straightforward like you are seeing.

Edit 07/30/2022: I have it working and here are two examples:

Price example must be between 0 and 250,000.

<Controller name="price" control={control} rules={{ required: 'Price is required.', min: 0, max: 250000 }} render={({ field, fieldState }) => (
   <>
      <label htmlFor={field.name} className={classNames({ 'p-error': errors.price })}>Price*</label>
      <InputNumber id={field.name} ref={field.ref} value={field.value} onBlur={field.onBlur} onValueChange={(e) => field.onChange(e)} mode="currency" currency="USD" locale="en-US" inputClassName={classNames({ 'p-invalid': fieldState.error })} />
      {getFormErrorMessage(fieldState)}
  </>
)} />

Year example must be between 1970-2030:

<Controller name="year" control={control} rules={{ required: 'Year is required.', min: 1970, max: 2050 }} render={({ field, fieldState }) => (
  <>
      <label htmlFor={field.name} className={classNames({ 'p-error': errors.year })}>Year*</label>
      <InputNumber id={field.name} ref={field.ref} value={field.value} onBlur={field.onBlur} onValueChange={(e) => field.onChange(e)} useGrouping={false} inputClassName={classNames({ 'p-invalid': fieldState.error })} />
      {getFormErrorMessage(fieldState)}
   </>
)} />

Try updating the value your self.

See here is an example for the same

const DropDownAdaptater = ({ input, meta, hintText, data, ...rest }: any) => {
  const [selectedUser, setSelectedUser] = useState(undefined)
  const [users, setUsers] = useState<IUser[]>([])
  useEffect(() => {
    const fetchUsers = async () => {
      const { data } = await api.get<IUser[]>('/users')
      setUsers(data)
    }
    fetchUsers()
  }, [])

  useEffect(()=>{
      // update the input value, when selected
      // note: it must be a single value and not an object
      input.value= selectedUser.userName; 
  },[selectedUser])

  return (
    <Dropdown
      {...input}
      value={selectedUser}
      options={users}
      onChange={(e) => setSelectedUser(e.target.value)}
      itemTemplate={selectedUserItemTemplate}
      valueTemplate={selectedUserValueTemplate}
      optionLabel="optionLabel"
      placeholder={hintText}
      style={{ marginRight: '1rem', width: '240px' }}
    />
  )
}