It is not normal, I believe, you need to negotiate better. Usually, large companies file for H1B at the next available H1B window. With H1B lottery and other new rules, personally I think it is risky to wait for an extra year. You may accept the position, if you are desperate, but you should push them to apply for next year in April 2019. Also, you should pursue other companies in parallel and find someone who can apply H1B in April 2019.