I know both of the above items quite well, but neither of those two items above explain in full the situation of a then-minor who even as a US-born person holds a right to Indian citizenship.

If after the Indian government recognized said minor's right to Indian citizenship via parent(s) -- something that is ordinarily considered as evidenced by very young minor's travel on parent's Indian passport -- then such person would continue to hold the de facto right to Indian citizenship until around the age of majority even if having been born in a foreign country with a jus soli citizenship principle in play.

That such minor-turned-major or other concerned party/parties failed to assert the right to Indian citizenship in a timely and effective manner is not the burden of the US government; nor is the outcome (of a failure to timely and effectively assert a right to Indian citizenship) the burden of the Indian government; nor is the outcome a result of some kind of actual incongruity in the ability to abide by laws in India and in the US at the same time.